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2 years ago

A) Reetu sold a watch to Reshmi at 20% profit. Reshmi again sold the same watch to

Mathematics

1 answer:

atroni [7]2 years ago

6 0

Answer:

1250,Rs

Step-by-step explanation:

Let Reetu paid for the watch x Rs. Then Reetu sold the watch to Reshmi having 20% profit => the selling price is 1.2*x

Then Teshmi sold the wathes with 10% loss (or 0.9 from purchase price 1.2x) to Nikita, i.e. selling price is

1.2*x*0.9=1350

1.08*x=1350

x=1350:1.08

x=1250, Rs

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The angle of depression from the aeroplane to the ground will be 30 degrees.

<h3>What is trigonometry?</h3>

Trigonometry is the branch of mathematics which set up a relationship between the sides and angle of the right-angle triangles.

Given that:-

An aeroplane is flying at the height of 10 km above the ground the distance along the ground from the aeroplane to the airport is 10√3 km

The angle of depression will be calculated as the angle between the horizontal and the height of the plane as shown in the figure below.

As we know that the perpendicular theta is height and the base ratio is angle tan theta.

tanФ = Height / Base

tanФ = 10 / 10 √3

tanФ = 1 / √3

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a bell rings every 8 miniutes and another 10 minutes. they both ring together at midnight. what time will they both ring at the

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12.40 am is the next time they both ring at the same time

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3 years ago

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(3,-2) and (-4, 5). Find the slope

nata0808 [166]

Answer:

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A ball is kicked 4 feet above the ground with an initial vertical velocity of 55 feet per second. The function h(t)=−16t2+55t+4

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<u>Given</u>:

A ball is kicked 4 feet above the ground with an initial vertical velocity of 55 feet per second.

The function $h(t)=-16t^2+55t+4$ represents the height h(in feet) of the ball after t seconds.

We need to determine the time of the ball at which it is 30 feet above the ground.

To determine the time that it takes for the ball to reach a height of 30 feet above the ground, let us substitute h(t) = 30, we get;

$30=-16t^2+55t+4$

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Adding both sides of the equation by 16t², we get;

$16t^2+26=55t$

Subtracting both sides of the equation by 55t, we have;

$16t^2-55t+26=0$

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The value of t is t = 0.6 because this denotes the time taken by the ball to reach a height of 30 feet from the ground.

Therefore, the time taken by the ball to reach a height of 30 feet above the ground is 0.6 seconds.

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