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AfilCa [17]
3 years ago
14

I need help please!1

Mathematics
2 answers:
krok68 [10]3 years ago
8 0

Answer:

It's B for the first one.

For the second one, it is C

Step-by-step explanation:

30 * 0.3 = 9

So 30% of 30 is 9. She did 9 windows.

0.52 = 52/100

It's 52/100 because 0.52 = 52%. 52% then equals 52/100.

52/100 = 13/25

So the answer is 13/25

Nutka1998 [239]3 years ago
7 0

Answer:

for the first picture, she cleans 30 windows

the second picture is 52/100 :)

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jarptica [38.1K]

Answer:

#2

Step-by-step explanation:

N/A

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3 years ago
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Explain if triangle ZHY is similar to triangle JHI . Justify your answer given the following information: HY = 3, YZ = 6, HZ = 7
mestny [16]
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The equation models the height h in centimeters after t seconds of a weight attached to the end of a spring that has been stretc
Nady [450]
This is the missing equation that models the hieght and is misssing in the question:

<span>h= 7cos(π/3 t)
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Answers:

<span>a. Solve the equation for t.
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<span>1) Start: h= 7cos(π/3 t)
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2) Divide by 7: (h/7) = <span>cos(π/3 t)
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3) Inverse function: arc cos (h/7) = π/3 t

4) t = 3 arccos(h/7) / π ← answer of part (a)



b. Find the times at which the weight is first at a height of 1 cm, of 3 cm, and of 5 cm above the rest position. Round your answers to the nearest hundredth.

<span>1) h = 1 cm ⇒ t = 3 arccos(1/7) / π</span>

t = 1.36 s← answer


2) h = 3 cm ⇒ t = 3arccos (3/7) / π =  1.08s← answer


3) h = 5 cm ⇒ 3arccos (5/7) / π = 0.74 s← answer



c. Find the times at which the weight is at a height of 1 cm, of 3 cm, and of 5 cm below the rest position for the second time.

Use the periodicity property of the function.

The periodicity of <span>cos(π/3 t) is 6.
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</span><span>
</span><span>So, the second times are:
</span><span>
</span><span>
</span><span>1) h = 1 cm, t = 6 + 0.45 s = 6.45 s ← answer
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2) h = 3 cm ⇒ 6 + 1.08 s = 7.08 s← answer


3) h = 5 cm ⇒ t = 6 + 0.74 s = 6.74 s ← answer



5 0
3 years ago
The position of a particle moving in a straight line at any time t is x(t) = 2t^2 + 6t + 5. What is the acceleration of the part
grandymaker [24]

Answer:

The acceleration of the particle at any time t

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Step-by-step explanation:

Given:

The position of a particle moving in a straight line at any time t is.

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In this condition the acceleration does not depending upon the time, so the acceleration is constant

Therefore the acceleration of the particle at any time t a = 4\ m/s^{2}

7 0
3 years ago
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xxTIMURxx [149]

Answer:

i think option 2 maybe i dont know

Step-by-step explanation:

sorry if I'm wrong I haven't done this in a while

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