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dimaraw [331]
3 years ago
11

What number is 28% of 25?

Mathematics
2 answers:
Anvisha [2.4K]3 years ago
7 0

Answer:

7

Step-by-step explanation:

what number is 28% of 25

Is means equals and of means multiply

N = 28% of 25

Change to decimal form

N = .28* 25

N =7

ankoles [38]3 years ago
7 0

We assume, that the number 25 is 100% - because it's the output value of the task.

25/x=100/28


(25/x)*x =(100/28)*x       - we multiply both sides of the equation by x


25 = 3.57142857143*x       - we divide both sides of the equation by (3.57142857143) to get x


25/3.57142857143 = x  

x=7

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This is the quadratic function:
h(x)=ax²+bx+c

We have two points:
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Now, we calculate this quadratic funtion.

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Therefore:
a(0)²+b(0)+c=0
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(1,58)
a(1)²+b(1)=58
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(2,112)
a(2)²+b(2)=112
4a+2b=112
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With the equations (1) and (2) we make a system of equations:
a+b=58
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we can solve this system of equations by reduction method.
-(a+b=58)
2a+b=56
---------------------
a=-2

-2(a+b=58)
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-------------------
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The function is:
h(x)=ax²+bx+c
h(x)=-2x²+60x

Now find the height, in feet, of the rock after 10 seconds in the air.

h(10)=-2(10)²+60(10)
h(10)=-200+600=400

Answer: 400 ft.
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