Question

A submarine left Diego Garcia and traveled toward St. Vincent. Three hours later a cruise ship left traveling at 16 km/h in an effort to catch up to the submarine. After traveling for five hours the cruise ship finally caught up. What was the submarine's average speed?

Shanice left Kali's house and drove toward the desert at an average speed of 70 km/h. Lisa left one hour later and drove in the opposite direction with an average speed of 55 km/h. find the number of hours Lisa needs to drive before they are 570km apart.

Answer 1

To determine the height of the building, we can use trigonometry. In this case, we can use the tangent function, which relates the angle of elevation to the height and shadow of the object.

The tangent of an angle is equal to the ratio of the opposite side to the adjacent side. In this scenario:

tan(angle of elevation) = height of building / shadow length

We are given the angle of elevation (43 degrees) and the length of the shadow (20 feet). Let's substitute these values into the equation:

tan(43 degrees) = height of building / 20 feet

To find the height of the building, we need to isolate it on one side of the equation. We can do this by multiplying both sides of the equation by 20 feet:

20 feet * tan(43 degrees) = height of building

Now we can calculate the height of the building using a calculator:

Height of building = 20 feet * tan(43 degrees) ≈ 20 feet * 0.9205 ≈ 18.41 feet

Therefore, the height of the building that casts a 20-foot shadow with an angle of elevation of 43 degrees is approximately 18.41 feet.