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3 years ago

the ratio of pencils to erasers is 4 to 1 if there are 20 pencils how many eraces are there please show ow work

Mathematics

1 answer:

Anna71 [15]3 years ago

4 0

I think it 5 because
4:1
8:2
12:3
16:4
20:5

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r-ruslan [8.4K]

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2 years ago

A rock is thrown up from the ground at a velocity of 84 feet per second. The formula h = -16t2 + 84t gives the rock's height in

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Answer:

h = 110.24 m

Step-by-step explanation:

It is given that,

A rock is thrown up from the ground at a velocity of 84 feet per second. The formula $h = -16t^2 + 84t$ gives the rock's height in feet after t second.

We need to find the maximum height of the rock. For maximum height put $\dfrac{dh}{dt}=0$

So,

$\dfrac{d( -16t^2 + 84t)}{dt}=0\\\\-32t+84=0\\\\t=\dfrac{84}{32}\\\\t=2.62\ s$

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Read 2 more answers