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17 answers · 3 days ago

divide by 5
(x-2)² = 7
square root
(x-2) = √7
x = 2+√7 = 4.65
divide by 5
(x-2)² = 7
square root
(x-2) = √7
x = 2+√7 = 4.65
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I don't understand how to do this help!!!1!!!!!!!!1
I don't understand how to do this help!!!1!!!!!!!!1
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• ### Math problem?

the sum of a number and its reciprocal is 13/6. Find the number
the sum of a number and its reciprocal is 13/6. Find the number
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• ### Can someone help me with this maths question, please?

Best answer: The path of the rocket is y=-4.9t^2+39.2t+h, where y is the height of the rocket at time t s measured from the ground. h is the height of the cliff. (a) After 10 s from start on top of the cliff, the rocket hits the ground=> 0=-4.9(10^2)+39.2(10)+h=> h=98 m (c)... show more
Best answer: The path of the rocket is
y=-4.9t^2+39.2t+h,
where y is the height of the rocket at time t s
measured from the ground. h is the height of
the cliff.

(a) After 10 s from start on top of the cliff, the
rocket hits the ground=>
0=-4.9(10^2)+39.2(10)+h=>
h=98 m

(c) y=-4.9t^2+39.2t+98=>
y'=-9.8t+39.2=0=>
t=4 s is the time needed for the rocket to reach
the max. height after start.

(b) The max. height
H=-4.9(4^2)+39.2(4)+98=>
H=176.4 m

(d) y'=-9.8(10)+39.2=-58.8 m/s
is the speed of the rocket when
hitting the ground.

(e) When the rocket passes by
the top of the cliff,
y=98=>
98=-4.9t^2+39.2t+98=>
t(-4.9t+39.2)=0=>
t=0 or t=39.2/4.9=8 s (when the rocket
bypasses it when coming down).
Ans. 8 s.
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