Questions posted in Mathematics

Write 13 tens as a sum of hundreds and tens

1 hundred and 3 tens

ANSWERED AT 23/09/2019 - 04:26 AM


QUESTION POSTED AT 23/09/2019 - 04:26 AM

Kyle cut a 4 foot piece of rope into pieces that are each 0.25 feet long. how many pieces of rope did he get.

Answer:

Kyle will get 16 pieces of 0.25 feet each

Step-by-step explanation:

The total length of rope is 4 feet

Kyle cut the rope so that each piece is 0.25 feet long

The total number of pieces that he can get is

4 / 0.25 which will gives us 16 pieces

So Kyle will get 16 pieces of 0.25 feet each

ANSWERED AT 23/09/2019 - 04:26 AM


QUESTION POSTED AT 23/09/2019 - 04:26 AM

On a graph with y values ranging from 108,175 to 986,432, what is a reasonable scale to use on y axis with 10 tick marks

Count by 100,000 sorry the answer is late

ANSWERED AT 23/09/2019 - 04:26 AM


QUESTION POSTED AT 23/09/2019 - 04:26 AM

Henry incorrectly said the rate 1/5 pound divided by 1/20 quart is 1/100 how do i find the correct answer

I don't know that well

ANSWERED AT 23/09/2019 - 04:26 AM


QUESTION POSTED AT 23/09/2019 - 04:26 AM

Following the order of operations, exponents should be simplified after completing all multiplication and division. True False well PEMDAS ^ its 2nd in line... i dont understand what they mean

Unless the exponet is on the outside of a parentheses then the exponet should be done first.

Example

(5x5)^2 - Inside the parentheses should be done first
and it ends up being - 625

But if the exponet is on the inside

(5x5^2) Then do the math for the exponet first
Then it becomes - 125


ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

Braden has 10 red model cars, which are 2/5 of the total number of cars in his collection. How many cars does Braden have in his collection? A) 4 B) 10 C) 25 D) 50

25 cars, because if 10 cars = 2/5 of his collection that means 5 cars are 1/5. Since 1/5 x 5 = 1, that means there are 25 cars in his collection. (5x5 = 25)

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

Help me factor this pls!! 49a^2−14a+1

You would multiply 49 by 1. After that you try to find the factors that would add to be -14 and multiply 1.
(49a-7)(49a-7)
Simplified:
(7a-1)(7a-1)

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

What does x equal in 7x - 8x =105

-1x = 105
x = -105

Thus x is equal to -105

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

True or False? 2.4: 0.6 = 20:5

False false false false false false false false false false false false false

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

A boat that costs $8550 decreases in value by 12% per year. How much will the boat be worth after 3 years?

You have to take $8,550 times 0.12 (12%) to find out the number it is being decreased by.
8,550 x 0.12 = 1,026
And then, you have to subtract 1,026 from 8,550 three times for three years and your answer becomes 5,472.
$5,472

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

Pls help me Factor x^2−4x+4 thx

Find the factors 
The factor is -2
Finally equation:
(x-2)(x-2)

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

Please help I'm so confused

Just look up the name of your worksheet then after the name type in answer key. If that doesn't work just download or search google "desmos calculator" and type in your points. (if you're on a IOS/ a phone or iPad then download the app. if you on a computer or something of that nature then teach it on google)

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

How to find percent of change#16

To calculate the percentage increase: First: work out the difference (increase) between the two numbers you are comparing. Then: divide the increase by the original number and multiply the answer by 100. If your answer is a negative number then this is a percentage decrease.

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

Everything please I'm so confused

Just look up the name of your worksheet online then after the name of it
type in answer key.

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

A grandmother says her grandson is two years older than her granddaughter and that together;they are at least 12 years old. How old are her grandson and granddaughter

What do you mean at least 12 
either way
the grandson will be at least 8
and the granddaughter will be at least 4

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

The digit in my hundreds place and the digit in my ones place are the same. The digit in my tens place is 1. The digit in my ones place is 5 more than 2. What number am I

The number is 717, 
You would simply get the answer by looking at all context clues. Hundreds = same as digit in ones, which is 700. Tens = 10. And ones = 7. Therefore, your answer would be 700. Also can be put as 700 + 10 + 7 = 717.

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

Use the graph to state the solution for the system. (In other words, what is the solution for the system?) x+2y=4 (line a) 3x-2y=4 (line b)

(2,1) is the solution because its where they both intersect..

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

On a recent day, 8 euros were worth $9 and 24 euros were worth $27. Write an equation of the form y = kx to show the relationship between the number of euros and the value in dollars.

Y = kx
We have to find k value, so lets say x is euros and y is American dollars
so we have
9 = k(8)
k = 1.125
so the equation will be  y = 1.125x
to prove it use another value given
y = 1.125x
y = 1.125 (24)
 y = 27
Thus 24 euros is 27 dollars.
Hence the equation y =1.125x is correct.          

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

Enter the ratio as a fraction in the lowest terms (no decimals) 0.03:0.5

3. 1
----- : -----
100. 2

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

What is a vertical line with a rise over run relationship that does not exist.

The line would be called undefined because it has no slope.

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

You are given the table below. x 4 8 12 16 20 f(x) 11 25 16 9 31 Use the table and n = 4 to estimate the following. Because the data is not monotone (only increasing or only decreasing), you should sketch a possible graph and draw the rectangles. 20 (integral) f(x)dx 4

Solution:

X      4      8       12       16          20

F(x)   11      25      16       9           31

A function is said to be increasing if , x_{1}> x_{2}, then f(x_{1})>f(x_{2}) {\text{and decreasing if } x_{1}> x_{2}, then f(x_{1})<f(x_{2}).

As you can see from the table given as x increases , f(x) increases as well as decreases.

So it is increasing as well as decreasing function.

Now plotting the graph on two dimensional coordinate plane and drawn perpendicular from these points on X axis.

\int_{4}^{20}f(x)dx=\int_{4}^{8}f(x)dx+\int_{8}^{12}f(x)dx+\int_{12}^{16}f(x)dx+\int_{16}^{20}f(x)dx

Equation of line joining two points (x_{1},y_{1}), and (x_{2},y_{2}) is \frac{y-y_{1}}{x-x_{1}}=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}

Equation of line joining two points (4,11) and (8,25) is

4(y-11)=14(x-4)

4 y -44 = 14 x -56

4 y = 14 x -12

y= \frac{7x}{2}-3 --------(1)

Area under line (1) is

\int_{4}^{8}f(x)dx=\int_{4}^{8}(\frac{7x}{2}-3) dx=\frac{7x^2}{4}-3x\left \{ {{x=8} \atop {x=4}} \right. =112-24-28+12=72

Equation of line joining (8,25) and (12,16) is

4(y-25 )= -9(x-8)

4 y - 100= -9 x + 72

4 y = -9 x + 172

y = \frac{-9x}{4} +43--------(2)

Area under line 2 is

\int_{8}^{12}f(x)dx=\int_{8}^{12}(\frac{-9x}{4} +43)dx=\left \{ {{x=12} \atop {x=8}}   \frac{-9x^2}{8} +43x = -162 +516+72-344=82

Equation of line joining (12,16) and (16,9) is

-4(y-16) = 7(x-12)

-4 y + 64= 7 x -84

-4 y = 7 x -148

y = \frac{-7x}{4} +37-----------(3)

Area under the line 3 is

\int_{12}^{16}f(x)dx=\int_{12}^{16}(\frac{-7 x}{4} +37)dx=\left \{ {{x=16} \atop {x=12}}   \frac{-7x^2}{8} +37 x = -224 +592+126-444=50

Equation of line joining (16,9) and (20,31) is

4(y-9) = 22(x-16)

4 y - 36 = 22 x - 352

4 y = 22 x - 316

y= \frac{11x}{2}-79---------(4)

Area under the line 4 is

\int_{16}^{20}f(x)dx=\int_{16}^{20}(\frac{11 x}{2} -79)dx

=\left \{ {{x=20} \atop {x=16}}   \frac{11x^2}{4} -79 x = 1100-1580-704+1264=2364-2284=80


Total Area = Area under the line (1+2+3+4)

=\int_{4}^{20}f(x)dx=\int_{4}^{8}f(x)dx+\int_{8}^{12}f(x)dx+\int_{12}^{16}f(x)dx+\int_{16}^{20}f(x)dx

= 72 +82+50+80

= 284 square units

You can find area using the formual of area of trapezoid which is = \frac{1}{2}[Sum of parallel sides]× [perpendicular distance between them]

ANSWERED AT 23/09/2019 - 04:25 AM


QUESTION POSTED AT 23/09/2019 - 04:25 AM

A grocery store has small bags of peanuts for $3 and large bags of peanuts for 5$. if you buy 12 bags and spend $42 how many of each size bag did you buy

I have the answer
i just can't show you, hold on a second

ANSWERED AT 23/09/2019 - 04:24 AM


QUESTION POSTED AT 23/09/2019 - 04:24 AM

I need help with this question. can someone please help me

-2x + y =3
use 5 number and put it in above equation to find y, I will use -2,-1,0,1,2
x      y
-2   -1
-1    1
 0    3
 1    5
 2    7

Then draw the graph, find another point in the graph which intersect the slope, 
lets say i found (-3,-3)which is on the slope
to prove it, i put (-3,-3) in the equation -2x + y = 3
and i got 
3 = 3
Thus it is correct.

ANSWERED AT 23/09/2019 - 04:24 AM


QUESTION POSTED AT 23/09/2019 - 04:24 AM

Find three positive whole numbers that have the same answer added together or when multiplied together.

Zero, Zero+Zero+Zero=0
0x0x0=0

ANSWERED AT 23/09/2019 - 04:24 AM


QUESTION POSTED AT 23/09/2019 - 04:24 AM

Can someone tell me how to do it

You do 113 minus the male sheep which is 47 and you get 66 female sheep. Then after that it says" how many more female sheep than male sheep so u minus the 47 from the 66 and u end up getting 19.The answer is 19

ANSWERED AT 23/09/2019 - 04:24 AM


QUESTION POSTED AT 23/09/2019 - 04:24 AM

A mountain climber is at an elevation of 10,712 feet. After 4 hours, he is at an elevation of 8,884 feet. Find the climber’s vertical speed using this formula:

I am not sure about the formula but if you subtract 8,884 from 10,712 you get 1,828. Then, if you divide that by 4 you get 457. 457 fph(feet per hour) should be the climbers vertical speed.

ANSWERED AT 23/09/2019 - 04:24 AM


QUESTION POSTED AT 23/09/2019 - 04:24 AM

Draw a quick picture to find the sum or difference 3.27 - 1.84=

Honestly, just draw one big box, label it as 3.27, then make a smaller box inside of the first, and label that 1.84. next to the box inside of a box, put =1.43

ANSWERED AT 23/09/2019 - 04:24 AM


QUESTION POSTED AT 23/09/2019 - 04:24 AM

If the sales tax rate is 7.25% in California,then how much would you pay in Los Angeles for a pair of shoes that cost $39.00? Need by 10:00 and showed work

39*7.25% = 2.8275 roundup to 2.83
39+2.83 = 41.83 & that is the total cost after tax

ANSWERED AT 23/09/2019 - 04:24 AM


QUESTION POSTED AT 23/09/2019 - 04:24 AM