2 years ago

I need help with all these questions

Mathematics

1 answer:

yKpoI14uk [10]2 years ago

8 0

Answer:

Step-by-step explanation:

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19. Find the pressure exerted by a force of 240 newtons on an area of 30cm? Please help I will mark as brilliant

Dafna1 [17]

Answer: 80000

Step-by-step explanation:

p=f

24

0.003

NOTE:30 ÷10000=0.030km

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3 years ago

A dance school allows a maximum of 15 students per class of 112 students signing up for class how many classes does the school n

STALIN [3.7K]

The school needs to offer 8 classes

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2 years ago

Read 2 more answers

If you subtract 12 from my number and multiply the difference by - 5, the result is -90." What is Sara's number?

Natali [406]

Answer:

Step-by-step explanation:

Do the steps in reverse

-90 divided by -5 = 18

18 + 12 = 30

Your answer is 30

Hope I helped :)

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5 0

2 years ago

Marty swims 36 yards in 42 seconds. If he continues to swim at this rate how many seconds will it take Marty to swim 500 yards

IceJOKER [234]

42 divided by 36 = 1.166666666667
1.1666666666667 times 500 = 583.333333333333 seconds

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3 years ago

What is the average rate of change of f over the interval -1 on a separate sheet of paper and upload the work as a photo. Show a

Anarel [89]

Answer:

Average rate of change for the function $f(x)= x^2-x-1$ over the interval -1<x<1 is -1

Step-by-step explanation:

We need to find average rate of change of f over the interval -1 < x < 1

The function given is: $f(x)= x^2-x-1$

The formula used to find average rate of change is:

$Average\:rate\:of\:change=\frac{f(b)-f(a)}{b-a}$

We have, a = -1 and b = 1

Finding f(b) when b=1

$f(x)=x^2-x-1\\f(1)=(1)^2-(1)-1\\f(1)=1-1-1\\f(1)=-1$

Now, finding f(a), when a= -1

$f(x)=x^2-x-1\\f(-1)=(-1)^2-(-1)-1\\f(1)=1+1-1\\f(-1)=2-1\\f(-1)=1$

Now, putting values and finding average rate of change

$Average\:rate\:of\:change=\frac{f(b)-f(a)}{b-a}\\Average\:rate\:of\:change=\frac{f(1)-f(-1)}{1-(-1)}\\Average\:rate\:of\:change=\frac{-1-(1)}{1-(-1)}\\Average\:rate\:of\:change=\frac{-1-1}{1+1}\\Average\:rate\:of\:change=\frac{-2}{2}\\Average\:rate\:of\:change=-1$

So, average rate of change for the function $f(x)= x^2-x-1$ over the interval -1<x<1 is -1

4 0

2 years ago