I. You deposit $25 in your account.
2 answers:
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Alees and Emma spend 1064 hours together
<em><u>Solution:</u></em>
Given that, Alees and Emma design an office park in 28 weeks
Each architect spends 19 hours each week on this project
To find: Total number of hours the architects work on this project
From given,
Total number of weeks = 28
Each architect spends 19 hours each week
Therefore,
Time spent in one week by Alees = 19 hours
Time spent in one week by Emma = 19 hours
<em><u>Total number of hours the architects work on this project</u></em>
Thus, they spend 1064 hours together
a. The rocket splashes down after 63.94 seconds.
b. The rocket peaks at 7386.68 m
<h3>a. How to find when the rocket splashes down?</h3>
Since the height of the rocket is h(t) = -4.9t² + 370t + 402, the rocket splashes down when h(t) = 0.
So, h(t) = 0
-4.9t² + 370t + 402 = 0
Using the quadratic formula, we find t.
where a = -4.9, b = 370 and c = 402
So,
Since t cannot be negative t = 63.94 s
So, the rocket splashes down after 63.94 seconds.
<h3>b. How to find the peak of the rocket?</h3>Since h(t) = -4.9t² + 370t + 402, to find the time the rocket reaches it peak, we differentiate h(t) with respect to t and equate to zero.
Soi, dh(t)/dt = d(-4.9t² + 370t + 402)/dt
= -9.8t + 370
dh(t)/dt = 0
-9.8t + 370 = 0
-9.8t = -370
t = -370/-9.8
t = 37.76 s
Substitung t = 37.76 into h(t), we have
h(t) = -4.9t² + 370t + 402
h(37.76) = -4.9(37.76)² + 370(37.76) + 402
h(37.76) = -4.9(1425.82) + 370(37.76) + 402
h(37.76) = -6986.518 + 13971.2 + 402
h(37.76) = 7386.682 m
h(37.76) ≅ 7386.68 m
So, the rocket peaks at 7386.68 m
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