Please help with problem 8. (ONLY IF YOU KNOW)

QUESTION POSTED AT 10/10/2019 - 07:35 PM

Answered by answersmine AT 10/10/2019 - 07:35 PM

The answer for the question is 2.49 times 3 and add that to 3.19 times 2 and add 4.99 times 4 which equals $33.81
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Which calculation should be completed first to solve this story problem? Allister bought some sheet music. He bought 6 songs for $0.99 each and 1 book for $16.99. He paid $1.38 in sales tax. He gave the cashier $50. How much change should Allister get? A. total cost of all the purchases B. total cost of 6 songs C. sum of the cost of 1 song, the book, and the tax D. the change

A. total cost of all the purchases

You can't calculate the sales tax on the sheet music or the change for $50 he would have received (which requires subtracting the total cost from $50) until you know how much the sheet music cost total.

 The B) and C) options aren't  relevant to the problem. You're trying to find the amount of change he gets after paying the total cost for all the sheet music + the tax on that.

ANSWERED AT 17/10/2019 - 09:13 AM


QUESTION POSTED AT 17/10/2019 - 09:13 AM

I need to know #25. What is p? Hurry please

Hey there!

In order to solve this problem, you'll want to combine like terms. You can do this by cancelling out terms in your equation and combining them with the similar terms (for example, numbers with no unknown term can be combined, numbers with the same unknown term can be combined, etc.)

To cancel out terms, you will add or subtract (and eventually multiply or divide) to get the term on one side to zero. You will then complete what you just did to cancel out the term on the other side. See below:

–7 – 7p = 3p + 23
+ 7                  + 7

–7p = 3p + 30
+7p  +7p

10p + 30

10p + 30 will be your simplified equation. There's no wrong way to combine like terms, just be careful to double check whether you should add or subtract. 

After that, all you need to do is solve for the term p. After you get rid of all of the terms on one side, that side will be equal to zero. So, you just need to find the number that will make your equation equal zero. 

10p + 30 = 0
       –30    –30

10p/10 = –30/10

p = –3

Hope this helped you out! :-)

ANSWERED AT 17/10/2019 - 09:08 AM


QUESTION POSTED AT 17/10/2019 - 09:08 AM

Quadrilateral EFGH has coordinates E(a, a), F(3a, a), G(2a, 0), and H(0, 0). Find the midpoint of EF? Please show how the problem is done.

Answer:

The midpoints of the EF is (2a,a) .

Step-by-step explanation:

Definition of midpoints.

The midpoint is the point lie in middle of a line segment. It is equidistant from both endpoints .

Formula

Midpoints = (\frac{x_{2}+x_{1})}{2} ,\frac{(y_{2}+y_{1}}{2})

Quadrilateral EFGH has coordinates E(a, a), F(3a, a), G(2a, 0), and H(0, 0).

Now find out the midpoints of the  E(a, a) and F(3a, a) .

Midpoints\ of\ EF = (\frac{(3a+a)}{2} ,\frac{(a+a)}{2})

Midpoints\ of\ EF = (\frac{4a}{2} ,\frac{2a}{2})

Midpoints of EF = (2a,a)

Therefore the midpoints of the EF is (2a,a) .



ANSWERED AT 17/10/2019 - 09:01 AM


QUESTION POSTED AT 17/10/2019 - 09:01 AM

How can you use functions to solve real world problems ??

You can use functions to slove real world problems by saying if some thing cost 2 dollar you would have 1 thing

ANSWERED AT 17/10/2019 - 08:21 AM


QUESTION POSTED AT 17/10/2019 - 08:21 AM

I know the answer to this problem I just don't know how I got it. Help?

Any negative sign under a radical is characterized as i, being imaginary since it is not possible. So you are therefore left with 8/16 which is equivalent to 1/2 minus the imaginary number of i

ANSWERED AT 17/10/2019 - 08:13 AM


QUESTION POSTED AT 17/10/2019 - 08:13 AM

A. Solve the differential equation y prime equals the product of 4 times x and the square root of the quantity 1 minus y squared. b. Explain why the initial value problem y prime equals the product of 4 times x and the square root of the quantity 1 minus y squared with y(0) = 4 does not have a solution.

Answer:

Step-by-step explanation:

Given is a differential equation as:

y'=4x\sqrt{1-y^2}

We can solve this by separation of variables method

\frac{dy}{\sqrt{1-y^2} } =4xdx\\sin^{-1} y = 2x^2+C

To find C:

Given y(0) =4

Substitute x=0 and y =4

sin inverse of 4 = C

But sin inverse is valid only for values between -1 and 1

Hence C is not a real value

No solution for this.

ANSWERED AT 17/10/2019 - 08:07 AM


QUESTION POSTED AT 17/10/2019 - 08:07 AM

Stuck in this problem help please

Use trigonometry.

tan30° = perpendicular / base

Here for angle 30° , x is perpendicular while 10 is the base.

tan30° = 1/√3
1/√3 = x/10
x = 10/✓3

By rationalising
x = 10√3/3

Hope This Helps You!

ANSWERED AT 17/10/2019 - 07:14 AM


QUESTION POSTED AT 17/10/2019 - 07:14 AM

When planning his crops, Farmer Tim knows that his 7 acres can support peas and carrots. He wants to make $7,000 from his crops. He can make $2,000 per acre of peas (the variable p) and $1,000 per acre of carrots (the variable c). Which equation below would be a constraint in his system of equations? a. 2,000p + 1,000c = 7,000 b. 2,000p − 1,000c = 7,000 c. p + c = 7 d. c − p = 7

Answer:  

The correct option is C). p + c = 7

Step-by-step explanation:

Let number of acres available for peas = p acre

And number of acres available for carrot = c acre

Now, One acre of peas make $2000

And one acre of carrot makes $1000

So, to make a total amount of $7000, the required equation is :

2000p + 1000c = 7000

and total available acres of land for planning the crops = 7 acres

⇒ p + c = 7

Hence, the equation of the problem is : 2000p + 1000c = 7000 with subject to the constraints : p + c = 7

Therefore, The correct option is C). p + c = 7

ANSWERED AT 17/10/2019 - 07:06 AM


QUESTION POSTED AT 17/10/2019 - 07:05 AM

Hey, do any of you guys know how to plot functions on a graph. You know like f(X) and g(X)? I find it really hard and also do you have any tips?

It helps if you have an example, like f(x) = 2x+3
What you typically do, is:

- draw xy axis, label them (ie., 1,2,3,4 along both axes)
- calculate the f(x) values for several x (e.g., -2, 0, 1, 3, doesn't matter).
- plot the calculated values as points. The calculated f(x) is your y value.
- sketch a smooth line through the points. It helps if you know in advance if the line is going to be straight or curved. 
- The more points you calculate, the more accurate your graph will be

ANSWERED AT 17/10/2019 - 07:03 AM


QUESTION POSTED AT 17/10/2019 - 07:03 AM

I need help on b, the answer is 770 but I don't know how to work it out, please show your working:)

The area of a rhombus is the product of the diagonals divided by 2. In this question, the diagonals are given, so that's really easy. Let's convert the measures to meters, that'll help for the final area calculation:

Area of one rhombus: (0.52x0.30)/2 = 0.078 m²

In 60 m², you can fit 60/0.078 tiles. That's 769.23, rounded to 770 since you'll have to cut up the last tile.

ANSWERED AT 17/10/2019 - 07:03 AM


QUESTION POSTED AT 17/10/2019 - 07:03 AM

In class we are using special sum formulas but don't know how to get the answer for this question

You are referring to:

\sum\limits_{i=1}^{n}{i} = \frac{n(n+1)}{2}

You can solve your problem by calculating

\sum\limits_{i=1}^{525}{i} = \frac{525\cdot526}{2} = 138075

and then subtracting the first bit:

\sum\limits_{i=1}^{19}{i} = 190

So 138075 - 190 = 137885

ANSWERED AT 17/10/2019 - 07:03 AM


QUESTION POSTED AT 17/10/2019 - 07:03 AM

How to know what it is how to solve it

The key to this type of question is to look at the graph and see if there's any useful points or properties you can notice to check against  the various functions they give you in the choices. My eye tells me that when x=2 the graph of the function is 0, so maybe start there to narrow down your choices.

ANSWERED AT 17/10/2019 - 06:06 AM


QUESTION POSTED AT 17/10/2019 - 06:06 AM

Is the given answer a reasonable solution to the problem? 7.92 • 10.21 = 808.632 A. No B. Yes REALLY NEED HELP IF YOU DONT KNOW PLEASE DONT ANSWER

Oh ok I am in middle school how would I know

ANSWERED AT 17/10/2019 - 05:47 AM


QUESTION POSTED AT 17/10/2019 - 05:47 AM

If rectangle ABCD is a golden rectangle, and ABFE is a square, then what do you know about CDEF?

I searched for an image of a golden rectangle. I also found a similar question with the given choices:
a) CDEF is a square.
b)The length of CDEF is twice its width.
c)CDEF is not a golden rectangle.
d)CDEF is a golden rectangle.

MY ANSWER IS: d) CDEF is a golden rectangle.

I found phrase online with regards to golden rectangle which helped me arrived to my choice of answer.

"A golden rectangle with longer side a and shorter side b, when placed adjacent to a square with sides of length a, will produce a similar golden rectangle with longer side a + band shorter side a.

This illustrates the relationship 
{a+b} / a = a / b = φ" 

ANSWERED AT 17/10/2019 - 05:39 AM


QUESTION POSTED AT 17/10/2019 - 05:39 AM

Stephen is 5'7". Him and his class mates want to know how many Stephens it would take to get to The Sun (4.8 billion feet from the Earth) Calculate how many Stephens it would take to reach The Sun

5'7" is Stephen's height

4.8 billion is the distance to the sun.

4.8 billion ft / 5'7" = 859,701,493 ft

ANSWERED AT 17/10/2019 - 05:38 AM


QUESTION POSTED AT 17/10/2019 - 05:38 AM

I need to know the area for this

I hope this helps you



A=(3+1).2/2



A=4

ANSWERED AT 17/10/2019 - 05:36 AM


QUESTION POSTED AT 17/10/2019 - 05:36 AM

A. Describe a dilation (center and scale factor) that transforms triangle RST into triangle R'S'T' or explain why it cannot be done. b.In either case, use complete sentences to describe the relationship that exists between the corresponding sides and angles (I'll attach the illustration for the problem below)

Answer:  The center of dilation is the origin (0, 0) and scale factor is 3.

Step-by-step explanation:  We are given to describe a dilation that that transforms ΔRST to ΔR'S'T', or to explain why it cannot be done.

We can see in the figure provided that both the triangles are right-angles at angles S and S'

Also, RS = ST = 1 unit   and   R'S' = S'T' = 3 units.

Using Pythagoras theorem, we have

RT^2=RS^2+ST^2=1^2+1^2=2\\\\\Rightarrow RT=\sqrt 2,

and

R'T'^2=R'S'^2+S'T'^2=3^2+3^2=18\\\\\Rightarrow R'T'=3\sqrt 2.

Therefore, the ratio of the corresponding sides will be

\dfrac{R'S'}{RS}=\dfrac{3}{1}=3,~~\dfrac{S'T'}{ST}=\dfrac{3}{1}=3,~~~\dfrac{R'T'}{RT}=\dfrac{3\sqrt 2}{\sqrt 2}=3\\\\\\\dfrac{R'S'}{RS}=\dfrac{S'T'}{ST}=\dfrac{R'T'}{RT}=3.

Since the ratio of the corresponding sides are equal, so the two triangles are similar.

Hence, ΔRST can be dilated to form ΔR'S'T'.

The center of dilation will be origin (0, 0), because the shapes of the two triangles are same with respect to the origin.

Also, since the ratio of any two corresponding sides of the triangles is 3, so the scale factor is 3.

Thus, ΔRST can be dilated to ΔR'S'T' with origin (0, 0) as the center of dilation and scale factor 3.

ANSWERED AT 17/10/2019 - 05:33 AM


QUESTION POSTED AT 17/10/2019 - 05:33 AM

The circumference (C) of a swimming pool is 47 feet. Which formula can you use to find the radius (r) if you know that C = 2π r ?

You'd solve the circumference formula for r
C=2πr = 47
r=47/(2π) = 7.48

ANSWERED AT 17/10/2019 - 05:25 AM


QUESTION POSTED AT 17/10/2019 - 05:25 AM

Can someone help me with the rest of the problems not 1,2 or 5 though

3. This was spun 50 times, and it landed on yellow 6 times. Therefore, it won't land on yellow all but 6 times. P(not yellow) is 44/50, or 22/25.
4. If 50 students are asked, and 7 have a dog, then the probability is 7/50. We can use a proportion to find the equivalent of 7/50 with a denominator of 1400, because that is how many people are at the school. 7/50=x/1400. 50x=9800. x=196

ANSWERED AT 17/10/2019 - 05:15 AM


QUESTION POSTED AT 17/10/2019 - 05:15 AM

Does anyyone know how to do this? i'm stuck... please help

The formula for a cylinders surface area is

A=2πrh+2πr2

ANSWERED AT 17/10/2019 - 05:11 AM


QUESTION POSTED AT 17/10/2019 - 05:11 AM

Help answer these problems please

I dont know loo it up

ANSWERED AT 17/10/2019 - 05:08 AM


QUESTION POSTED AT 17/10/2019 - 05:08 AM

Identify the corresponding word problem given the equation: x + 12.50 = 55.75

X= 43.23+12.50=55.75

ANSWERED AT 17/10/2019 - 05:05 AM


QUESTION POSTED AT 17/10/2019 - 05:05 AM

The sets of numbers 6,8,10 and 5,12,13 are Pythagorean triples. use what you know about the Pythagorean theorem and explain or show why they are Pythagorean triples. be sure to show your work for each set of triples

Pythagorean Triples are 3 whole numbers such that a^2 + b^2 = c^2
The biggest number must be the 'c' because it is across from the 90 degree angle and therefore the longest side.
6^2 + 8^2 ?=? 10^2
36 + 64 ?=? 100
100 = 100
This is true so 6,8,10 is a Pythagorean triple.
5^2 + 12^2 ?=? 13^2
25 + 144 ?=? 169
169 = 169
This is true so 5,12,13 is a Pythagorean triple.

ANSWERED AT 17/10/2019 - 05:03 AM


QUESTION POSTED AT 17/10/2019 - 05:03 AM

Anyone know how to do this?

Area of the rectangle ==> 9x13 =117 cm²

Area of the right triangle ==> 11x(5)/2 =55/2 cm²


Total area = 117 + 55/2 = 289/2 = 144.5 cm²

ANSWERED AT 17/10/2019 - 04:51 AM


QUESTION POSTED AT 17/10/2019 - 04:51 AM

Help me with this problem I think I did it wrong!

(2x^2-27x+91) is the right answer

ANSWERED AT 17/10/2019 - 04:44 AM


QUESTION POSTED AT 17/10/2019 - 04:44 AM

Please help me with this problem

The answer is B, 3/4 miles to 1/2 inch which means 1.5 miles to 1 inch, because in the second map, the inches were divided by 2, making the map smaller, therefore we should double the scale to get the same measurments

ANSWERED AT 17/10/2019 - 04:02 AM


QUESTION POSTED AT 17/10/2019 - 04:02 AM

Someone one help me it involves problem solving with linear models i believe it is c

Y-intercept in this case means the average cost of a ticket in year 2005

then it increased

So it is A


If you still need help, just let me know!

 

ANSWERED AT 17/10/2019 - 03:50 AM


QUESTION POSTED AT 17/10/2019 - 03:50 AM