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Angelina_Jolie [31]
2 years ago
12

Jorge paid $9 for a book that was originally $12. What was the % discount for the book

Mathematics
1 answer:
anastassius [24]2 years ago
6 0

Answer:

25%

Step-by-step explanation:

12=100%

3=25%

9=75%

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How to find 4x=14y and if it is parallel, perpendicular or neither to -2x+7y=14
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4x = 14y
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answer
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3 years ago
Regina has just opened her new yarn shop. She makes $4.00 on every skein of yarn sold and her monthly expenses are $3,800. Which
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Step-by-step explanation:

6 0
2 years ago
The height of a tennis ball tossed into the air is modeled by h(x) = 40x â€" 16x 2, where x is elapsed time in seconds. During w
egoroff_w [7]

The time interval x >0.5 and x > 2.04 will the tennis ball be at least 15 feet above the ground.

Given that,

The height of a tennis ball tossed into the air is modeled by,

\rm h(x) = 40x - 16x^2

Where x is elapsed time in seconds.

We have to determine,

During what time interval will the tennis ball be at least 15 feet above the ground?

According to the question,

The height of a tennis ball tossed into the air is modeled by,

\rm h(x) = 40x - 16x^2

Where x is elapsed time in seconds.

Then,

When the tennis ball be at least 15 feet above the ground,

h(x) = 15

Substitute the value of h(x) in the equation,

\rm h(x) = 40x - 16x^2\\\\ 15 = 40x - 16x^2\\\\ 16x^2-40x+15=0

Factorize the equation for finding the time interval will the tennis ball be at least 15 feet above the ground is,

\rm 16x^2-40x+15= 0\\\\x = \dfrac{-b\pm \sqrt{b^2-4ac}}{2a}\\\\x = \dfrac{-(-40)\pm \sqrt{(-40)^2-4 \times 16 \times 15}}{2 \times 16}\\\\x =  \dfrac{-(-40)\pm \sqrt{1600- 960}}{32}\\\\x =  \dfrac{40\pm \sqrt{640}}{32}\\\\x =  \dfrac{40 + 25.29}{32} \\\\x =  \dfrac{40 + 25.29}{32} \ and \ x =  \dfrac{40 - 25.29}{32}\\\\x = \dfrac{65.29}{32} \ and \ x = \dfrac{14.71}{32}\\\\x = 2.04 \ and \ x = 0.45

Hence, The time interval x >0.5 and x > 2.04 will the tennis ball be at least 15 feet above the ground.

For more details about Inequality refer to the link given below.

brainly.com/question/17177510

7 0
2 years ago
The average speed of one airplane is 200 mph faster than that of an automobile. If the automobile starts at 3 a.m. and the airpl
alina1380 [7]

Answer:

Step-by-step explanation:

Let the speed of the car be "X". From 3 am until 1 pm (10 hours), the car will travel 10*X miles. 

The speed of the airplane is (X +200). From 11 am until 1 pm (2 hours), the plane will travel 2*(X+200). 

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Subtract 2*X from both sides: 

8*X = 400

X = 400/8 = 50 mph.

3 0
3 years ago
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