Can some one please help on number 8

Mathematics

2 answers:

Greeley [361]3 years ago

6 0

X=13 1/3

So first you have to add 16 +4 = 20. Then, simplify 3/2 to 1.5. Finally divide 20 by 1.5 = 13.333333333, or 13 1/3

nikdorinn [45]3 years ago

3 0

Here is a photo of the steps I took to get 13 1/3
The goal is to isolate the x and then solve.

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Arianna kicks a soccer ball off the ground and into the air with an initial velocity of 42 feet per second. Assume the starting

beks73 [17]

A=g

v=⌠g dt

v=gt+C, where C=v initial

v=gt+vi

h=⌠v dt

h=gt^2/2+vit+C, where C=h initial

h=gt^2/2+vit+hi

We are told that vi=42 ft/s, hi=0, and we know g≈-32 ft/s^2 so

h(t)=-16t^2+42t

The ball will hit the ground when h=0 so

-16t^2+42t=0

-2t(8t-21)=0, since t>0

8t-21=0

8t=21

t=21/8

t=2.625 sec

t≈2.6 sec (to nearest tenth of a second)

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3 years ago

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Thanks to whoever can help me!

alexandr1967 [171]

2 1/2 .need 20 characters to post

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