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3 years ago

The price of a radio was $20. It is on sale for $15. What is the percent of change in the price of a radio?

Mathematics

1 answer:

ki77a [65]3 years ago

4 0

Answer:

15%

Step-by-step explanation:

set up 15/20= x/100

cross multiply to solve for x

1500=20x

x= 75

15 dollars is 75% of the original price, so there was a 15% change

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3 years ago

The hypotenuse of an isosceles right triangle is 16 centimeters. Find the length of the 2 other sides of the triangle to the nea

scZoUnD [109]

Right triangle means we can use a^2+b^2=c^2
isosceles means 2 sides are equal legnths

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(a^2)+(a^2)=c^2
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3 years ago

What is the value of the exponential expression below? 36^1/2

Dmitry [639]

Answer:

Step-by-step explanation:

It's the square root of 36

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3 years ago

Which two quadrilaterals are reflections of each other across the y-axis?

ICE Princess25 [194]

Answer:

Step-by-step explanation:

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3 years ago

She needs to buy at least 100 chairs. Chairs with arms cost $80. Chairs without arms cost $70. Ms. Robinson can spend, at most,

stealth61 [152]

Answer:

50 chairs with arms and 50 without arms will cost $7500

Step-by-step explanation:

Create two equations using the given information. The unknowns are :

W = Number of chairs with arms

N = Number of chairs with No arms

First equation (associated with the total number of chairs to buy):

W + N = 100

Second equation (associated with the amount to spend):

80 W + 70 N = 7500

Solving: solve for W in the first equation: W = 100 - N

Use it to substitute for W in the second equation:

80 (100 - N) + 70 N = 7500

8000 - 80 N + 70 N = 7500

subtract 8000 from both sides and combine

- 10 N = - 500

Divide both sides by -10 in order to solve for N

N = -500 / (-10) = 50

Now use this value in the substitution equation to solve for W:

W = 100 - 50 = 50

So the person can buy 50 chairs with arms and 50 chairs without arms paying for them $7,500.

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3 years ago