3 years ago

I need help with a problem

Mathematics

1 answer:

stira [4]3 years ago

8 0

I only know question 3

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For bills gym membership, he pays $25 per month plus a one dollar charge per class he takes. Bills total for last month was $32.

wlad13 [49]

7 classes because $32 -$25 = 7 (where $25 is for one month, and the 7 is how much is left over of the total and 1 class = $1 dollar)

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the area of a square whose sides have length x cm is increasing at the rate of 12cm²/s. how fast is the length of a side increas

katovenus [111]

Answer:

0.67 cm/s

Step-by-step explanation:

The area of a square is given by :

$A=x^2$ ....(1)

Where

x is the side of a square

$\dfrac{dA}{dt}=12\ cm^2/s$

Differentiating equation (1) wrt t.

$\dfrac{dA}{dt}=2x\times \dfrac{dx}{dt}$

When A = 81cm², the side of the square, x = 9 cm

Put all the values,

$12=2\times 9\times \dfrac{dx}{dt}\\\\\dfrac{dx}{dt}=\dfrac{2}{3}\\\\\dfrac{dx}{dt}=0.67\ cm/s$

So, the length of the side of a square is changing at the rate of 0.67 cm/s.

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2 years ago

Gears A and B turn together. Gear A turns 20 times when

Bingel [31]

Answer: Gear B turns 90 times when gear A turns 60 times

Step-by-step explanation: To solve this you just 30x3=90

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3 years ago

On Monday, Noah finds 19 big grasshoppers and 9 small ones in his garden. What is the experimental probability of finding a smal

Lina20 [59]

That would be 9 /(19+9) = 9/28 Answer

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What are the domain and range of f(x)= log x-5?

Nookie1986 [14]

The answer is A
Domain: (0, infinity)
Range: ( - infinity, infinity)

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