# Questions posted in Mathematics

### Select all the expressions that are equivalent to the polynomial below. (4x+5)(-3x-1)A (-16x2 + 10x - 3) + (4x2 - 29x - 2)B 3(x - 5) - 2(6x2 + 9x + 5)C 2(x - 1) - 3(4x2 + 7x + 1)D (2x2 - 11x - 9) - (14x2 + 8x - 4)E (-15x2 + 9x - 10) + (3x2 - 10x - 5)F (4x2 - 13x - 7) - (16x2 + 9x - 5)

Options A,C and D

Step-by-step explanation:

(4x+5)(-3x-1) = -12x²-19x-5

Option A:

(-16x² + 10x - 3) + (4x² - 29x - 2) = -12x²-19x-5

Option A is correct.

Option B:

3(x - 5) - 2(6x² + 9x + 5) = -12x²-15x-25

Option B is wrong.

Option C:

2(x - 1) - 3(4x² + 7x + 1) = -12x²-19x-5

Option C is correct.

Option D:

(2x² - 11x - 9) - (14x² + 8x - 4) = -12x²-19x-5

Option D is correct.

Option E:

(-15x² + 9x - 10) + (3x² - 10x - 5) = -12x²-x-15

Option E is wrong.

Option F:

(4x² - 13x - 7) - (16x² + 9x - 5) = -12x²-22x-2

Option F is wrong.

ANSWERED AT 07/12/2019 - 02:30 AM

QUESTION POSTED AT 07/12/2019 - 02:30 AM

### How to determine if a function is one to one algebraically?

All you have to do is multiply the least commen donomenator by 2 and that will be your answer

ANSWERED AT 07/12/2019 - 02:29 AM

QUESTION POSTED AT 07/12/2019 - 02:29 AM

### If the population decreases with a constant rate of change and the decrease is 7% in the first year, what will the town's population be in 6 years? (round to the nearest person)

Given that the population of a town today is 33,000 people.

If the population decreases with a constant rate of change and the decrease is 7% in the first year.

The decrease in the population of the town in the first year is given by 0.07 x 33,000 = 2,310

The decrease in the population of the town in 6 years is given by 2,310 x 6 = 13,860

Therefore, in 6 years, the town's population will be 33,000 - 13,860 = 19,140

ANSWERED AT 07/12/2019 - 02:28 AM

QUESTION POSTED AT 07/12/2019 - 02:28 AM

### Vince has 26 beads.how many different arrays can Vince draw to represent the total number of beads he has? list the sizes of the arrays .

Only one set of factors for 26, which is 2 by 13

ANSWERED AT 07/12/2019 - 02:25 AM

QUESTION POSTED AT 07/12/2019 - 02:25 AM

### A hand-held digital music player was marked down by 1/4 of the original price. a. If the sales price is $128.00, what is the original price? b. If the item was marked up by 1/2 before it was placed on the sales floor, what was that the store paid for the digital player.? Answer: a) The original price of music player is$170.66

b)If the item was marked up by 1/2 before it was placed on the sales floor, the store paid $213.325 for the digital player. Step-by-step explanation: Let the original price be x A hand-held digital music player was marked down by 1/4 of the original price. So, Discount = So, Sale price = We are given that the sales price is$128.00

So,   a) The original price of music player is $170.66 The item was marked up by 1/2 before it was placed on the sales floor. So, Cost = Cost = b)If the item was marked up by 1/2 before it was placed on the sales floor, the store paid$213.325 for the digital player.

ANSWERED AT 07/12/2019 - 02:25 AM

QUESTION POSTED AT 07/12/2019 - 02:25 AM

$12.50-the one-time fee of$2.50=$10.$10/every half mile $0.20=50, 50/a quarter mile=12.5 miles. ANSWERED AT 07/12/2019 - 02:05 AM QUESTION POSTED AT 07/12/2019 - 02:05 AM ### Rectangle A measures 12 cm by 3 cm. Rectangle B is a scaled copy of Rectangle A. Select all of the measurement pairs that could be the dimensions of Rectangle B. A. 6 cm by 1.5 cm B.10 cm by 2 cm C. 13 cm by 4 cm D.18 cm by 4.5 cm E.80 cm by 20 cm Answer: Options 'A' and 'D' are correct that could be the dimensions of Rectangle B. Step-by-step explanation: Since we have given that Dimensions of Rectangle A is given by 12 cm by 3 cm. And Rectangle B is a scaled copy of rectangle A. So, by options we can check : A. 6 cm by 1.5 cm so, it is scaled dimension copy of rectangle A. D.18 cm by 4.5 cm So, it is also scaled copy of rectangle A. Hence, Options 'A' and 'D' are correct that could be the dimensions of Rectangle B. ANSWERED AT 07/12/2019 - 02:04 AM QUESTION POSTED AT 07/12/2019 - 02:04 AM ### A trough is 12 ft long and its ends have the shape of isosceles triangles that are 5 ft across at the top and have a height of 1 ft. If the trough is being filled with water at a rate of 13 ft3/min, how fast is the water level rising when the water is 8 inches deep? I have been getting 13/30, but apparently, that is wrong? V=.5 * h * l * b Because of similar triangles: b = 5h (b/h = 5/1) l = 12 V = .5 * h * 5h * 12 V = 30h^2 (dV/dt) = 60 h (dh/dt) dV/dt = 13 h = .5 (because this is in feet) 13 = 60*.5(dh/dt) 13/30 = dh/dt Im confused can u teach me how to do this stuff ANSWERED AT 07/12/2019 - 02:04 AM QUESTION POSTED AT 07/12/2019 - 02:04 AM ### I'm working at a distribution place and need help i'm supposed to be averaging 1000 units every hours if i do 4800 in a shift i'm 48 minutes behind schedule how many units per a hour am i averaging Expected throughput is 1000 units/h Therefore the expected time for 4800 units is (4800 units)/(1000 units/h) = 4.8 hours = 288 minutes Because the worker is 48 minutes behind schedule, the actual time is 288 + 48 = 336 minutes = 5.6 hours The actual average throughput is (4800 units)/(5. h) = 857 units per hour. Answer: 857 units per hour. ANSWERED AT 07/12/2019 - 01:57 AM QUESTION POSTED AT 07/12/2019 - 01:57 AM ### Which quadrant is the point (5.2,-1.7) Located? IVIIIIII It will be in the bottom right quadrant which is quadrant IV ANSWERED AT 07/12/2019 - 01:57 AM QUESTION POSTED AT 07/12/2019 - 01:57 AM ### We _____ when calculating the average deviation, because the sum of all deviation scores around the mean equals zero. Subtract because it has to deal with the many signs ANSWERED AT 07/12/2019 - 01:57 AM QUESTION POSTED AT 07/12/2019 - 01:57 AM ### Find the equation of the circle with center at the origin that contains the point ( 12 , 9 ) (12,9). Radius is the length of line from centre to (12,9) Equation of circle: (x-12)+(y-9)=r^2 r=√12^2+9^2=√169 r^2=(√169)^2=169 hence, (x-12)+(y-9)=169 ANSWERED AT 07/12/2019 - 01:56 AM QUESTION POSTED AT 07/12/2019 - 01:56 AM ### Which ordered triple is a solution of this system? 2x + y - z = 7 -x - 2y + 4z = -15 x + 2y - 5z = 17 a) (3, 1, 0) b) (1, 3, -2) c) (2, 5, 2) d) (-2, 6, -5) Answer: b) (1, 3, -2) Step-by-step explanation: A suitable calculator can give you the answer to this right away. Or, you can try the answer choices in the equations to see which works. The answer choice that works is choice B. 2·1 +3 -(-2) = 7 -1 -2(3) +4(-2) = -15 1 +2(3) -5(-2) = 17 ANSWERED AT 07/12/2019 - 01:51 AM QUESTION POSTED AT 07/12/2019 - 01:51 AM ### The expression 0.09x+(x−30) models the final price of a bicycle with an instant rebate in a state that charges a sales tax. The tax is on the original price. Which expression represents the amount of tax that is paid on the bicycle? A) 1.09x B) 0.09x C) 0.09x - 30 D) x - 30 Actually I took the test and it was B. 0.09x. Btw the answer can't be 0.09x - 30 because we aren't finding what it equals we are finding "which expression represents the amount of tax that is paid on the bicycle". ANSWERED AT 07/12/2019 - 01:50 AM QUESTION POSTED AT 07/12/2019 - 01:50 AM ### Greg is 5 feet three inches tall and weighs 260 pounds. greg is ________. Greg is within the obese range. ANSWERED AT 07/12/2019 - 01:50 AM QUESTION POSTED AT 07/12/2019 - 01:50 AM ### It is known that the depth of a lake at a point with coordinates (x, y) is z = 200 + 0.02x2 − 0.001y3, where x, y, and z are measured in meters. a woman in a kayak starts at the point (80, 60) and moves toward another point located at (0, 0). (a) find du f(80, 60). (give your answer correct to at least two decimal places.) Given that the depth of a lake at a point with coordinates (x, y) is  ANSWERED AT 07/12/2019 - 01:50 AM QUESTION POSTED AT 07/12/2019 - 01:50 AM ### G what is the measure of the complement of the supplement of a 157degrees° ​angle Hmmmmmmm tuff one....... ANSWERED AT 07/12/2019 - 01:48 AM QUESTION POSTED AT 07/12/2019 - 01:48 AM ### Simplify the following expression 12 1/2 + (-25) The answer for this question is: -12 1/2 ANSWERED AT 07/12/2019 - 01:48 AM QUESTION POSTED AT 07/12/2019 - 01:48 AM ### A man has 20 coins in his pocket, all of which are dimes and quarters. if the total value of his change is 425 cents, how many dimes and how many quarters does he have? your answer is Using the guess and test method, I found that: 15 quarters =$3.75
5 dimes = $0.50 Total: 20 coins =$4.25 or 425 cents

ANSWERED AT 07/12/2019 - 01:48 AM

QUESTION POSTED AT 07/12/2019 - 01:48 AM

### Twelve people join hands for a circle dance. in how many ways can they do this?

479001600 different combinations

ANSWERED AT 07/12/2019 - 01:44 AM

QUESTION POSTED AT 07/12/2019 - 01:44 AM