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gaboalejandro833

17.11.2020 •

Mathematics

SOME ONE HELP PLZ CALCULATE THE CIRCUMFERENCE AND AREA OF A CIRCLE

SOME ONE HELP PLZ CALCULATE THE CIRCUMFERENCE AND AREA OF A CIRCLE

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Ответ:

essie10

09.02.2022

qwertyu

Step-by-step explanation:

ertrertrertretyretytr

rertretrrtret

rtrtrtrtr

trertr

trt

t

0,0(0 оценок)

Ответ:

jcotto3644

28.01.2020

t= 7.67

t= 10.13s

Step-by-step explanation:

Solving (a):

H=-16t^2+122t+5

Required: Time to hit the ground

This means that H = 0

So, we have:

0=-16t^2+122t+5

Rewrite as:

16t^2-122t-5=0

Solve for t using:

$t= \frac{-b \± \sqrt{b^2 - 4ac}}{2a}$

$t= \frac{122 \± \sqrt{(-122)^2 - 4*16*-5}}{2*16}$

$t= \frac{122 \± \sqrt{15204}}{2*16}$

$t= \frac{122 \± 123.3}{32}$

Split:

$t= \frac{122 + 123.3}{32}$ or $t= \frac{122 - 123.3}{32}$

$t= \frac{245.3}{32}$ or $t= \frac{-1.3}{32}$

t= 7.67 or t= -0.0406

Time can not be negative. so: t= 7.67

Solving (b):

h=-16t^2+162t+0.2

Required: Time to hit the ground

This means that h = 0

0=-16t^2+162t+0.2

Rewrite as:

16t^2-162t-0.2= 0

Solve for t using:

$t= \frac{-b \± \sqrt{b^2 - 4ac}}{2a}$

$t= \frac{162 \± \sqrt{(-162)^2 - 4*16*-0.2}}{2*16}$

$t= \frac{162 \± \sqrt{26256.8}}{32}$

$t= \frac{162 \± 162.04}{32}$

$t= \frac{162 + 162.04}{32}$ or $t= \frac{162 - 162.04}{32}$

$t= \frac{324.04}{32}$ or $t= \frac{-0.04}{32}$

Time can not be negative. So:

$t= \frac{324.04}{32}$

t= 10.13s

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