How can I get the average?

Mathematics

1 answer:

Zarrin [17]2 years ago

7 0

The average is pretty simple to find. Add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.

The answer to this specific question can be modeled as $\frac{72+76+x}{3}\geq 75$ . After simplifying everything, you would get x $\geq$ 77, so Justin has to get at least a 77 to get a 75 average.

You might be interested in

Write the ratio as a fraction in simplest form, with whole numbers in the numerator and denominator.

Katen [24]

40 as the numerator and 64 as the denominator which can be simplified to 5 over 8

3 0

2 years ago

An astronaut is working on a satellite 200 miles above the ground. What is the measure of BD⌢, the portion of Earth that the ast

natulia [17]

Answer:

420 miles.

Step-by-step explanation:

You would have to be infinitely far away from a sphere in order to see exactly 50% of its surface all at the same moment. Using simple geometry, you can prove that an observer that is a distance d away from the surface of a sphere with radius R can only see a percent area A of the sphere's surface as given by the equation:

A = 50%/(1+R/d)

Where A is the area seen,

R is the earth's radius 4000 miles

And D is the distance above the earth 200 miles

50% = 0.5 in fraction

Substituting values we have

A = 0.5(1 + 4000/200)

A = 0.5(1 + 20) = 0.5 x 21

A = 10.5%

10.5% of 4000 miles = 420 miles.

6 0

3 years ago