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3 years ago

Algebra 1

Mathematics

1 answer:

sleet_krkn [62]3 years ago

7 0

Answer:

i think the answer is -7/s

Step-by-step explanation:

Let's solve for n.

(−1s)(n)+12<19

Step 1: Add -12 to both sides.

−ns+12+−12<19+−12

−ns<7

Step 2: Divide both sides by -s.

−ns

−s

−7

Answer:

−7

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The diameter of a wheel of a lorry is 150cm. If the lorry travels 376.8m, how many times does the wheel rotate?

tresset_1 [31]

<h3>Answer: 79 full rotations</h3>

====================================================

Explanation:

150 cm = 150/100 = 1.5 m

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C = pi*1.5

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Then we divide the 376.8 over the circumference found

(376.8)/(4.71238898038469) = 79.9594434093682

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2 years ago

a street light is at the top of a 18 ft tall pole. a woman 6 ft tall walks away from the pole with a speed of 4 ft/sec along a s

shutvik [7]

The most appropriate choice for similarity of triangles will be given by -

Speed of tip of the shadow of woman = 6 ft/s

What are similar triangles?

Two triangles are said to be similar, if the corrosponding angles of the triangles are same and the corrosponding sides of the triangles are in the same ratio.

Here,

The diagram has been attached here

Let the distance of woman from the pole be x ft and the distance of tip of the shadow to the pole be y ft.

Height of street light = 18 ft

Height of woman = 6ft

The two triangles are similar [As height of woman is parallel to the height of pole]

$\frac{y - x}{6}=\frac{y}{18}\\18y - 18x = 6y\\18y - 6y = 18x\\12y = 18x\\y = \frac{18}{12}x\\y = \frac{3}{2}x\\$

To find the speed, we have to differentiate both sides with respect to time 't'

$\frac{dy}{dt} =\frac{3}{2}\frac{dx}{dt}\\\frac{dy}{dt}=\frac{3}{2} \times 4\\\frac{dy}{dt} = 6$

Speed of tip of her shadow = 6 ft

To learn more about similarity of triangles, refer to the link-

brainly.com/question/14285697

#SPJ4

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