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Delicious77 [7]
3 years ago
12

The track coach tells Dave that he still has 80% of his workout left. Dave has run 4 laps so far.

Mathematics
1 answer:
Tpy6a [65]3 years ago
7 0
20% equals 4
80% divided by 20% is 4
4x4=16

he has 16 laps left
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75

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If a 40-foot tree casts a 12-foot shadow, find the length of the shadow cast by a 28-foot tree
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2 years ago
he original price of a tractor was $45,000. The price of the tractor decreases at a steady rate of 8.3% per year. What is the va
Debora [2.8K]
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<em>$29178.25</em>

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<em>p = original price</em>

<em>r = 8.3% = 0.083</em>

<em>n = 5 years</em>

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5 0
3 years ago
Find the length of side AB<br> Give answer to 3 significant figures
Rina8888 [55]

Answer:

AB = 8.857 cm

Step-by-step explanation:

Here, we are given a <em>right angle</em> \triangle ABC in which we have the following things:

\angle A = 90 ^\circ\\\angle C = 41 ^\circ\\\text{Side }BC = 13.5 cm

Side <em>BC </em>is the hypotenuse here.

We have to find the side <em>AB</em>.

Trigonometric functions can be helpful to find the value of Side AB here.

Calculating \angle B:

Sum of all the angles in \triangle ABC is 180^\circ.

\Rightarrow \angle A + \angle B + \angle C = 180^\circ\\\Rightarrow 90^\circ + \angle B + 41^\circ = 180^\circ\\\Rightarrow \angle B = 49^\circ

We know that <em>cosine </em>of an angle is:

cos \theta = \dfrac{\text{Base}}{\text{Hypotenuse}}\\\Rightarrow cos B = \dfrac{AB}{BC}\\\Rightarrow cos 49^\circ = \dfrac{AB}{13.5}\\\Rightarrow AB = 13.5 \times 0.656\\\Rightarrow AB = 8.857 cm

So, side AB = 8.857 cm .

6 0
3 years ago
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