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olga nikolaevna [1]
3 years ago
8

The mean of four number is 20. If one of the number is 15, what is the sum of the other number?

Mathematics
1 answer:
nadya68 [22]3 years ago
6 0

The sum of the remaining numbers is 65.

In order to tell this we first need to find the sum of the numbers in total. In order to do that, we can multiply the average by how many numbers we have.

4*20 = 80

Since we have a total sum of 80, we can now just subtract the aforementioned 15 to get the answer to your question.

80-15 = 65

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Black_prince [1.1K]
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3 0
4 years ago
Question 1: The diagonal of a rectangle, with base x, remains at a fixed
kramer

We have that The height changing rate  when the length of the base is 2 cm

dh/dt=-7.2cm/s

From the question we are told

The diagonal of a rectangle, with base x, remains at a fixed value of 3cm. If the base is increasing at a rate of 8 cm/s. at what rate is  the height changing when the length of the base is 2 cm?

Generally the Pythagoras equation for the triangle   is mathematically given

as

r^2=h^2+x^2

With r=3

Therefore

dx/dt=8cm/s

Hence

2rdr/dt=2hdh/dt+2xdx/dt\\\\\dh/dt=\frac{-x}{r^2-x^2}dx/dt

We  have

dh/dt=-2/\sqrt{5}(8)\\\\dh/dt=-7.2cm/s

Therefore

The height changing rate  when the length of the base is 2 cm

dh/dt=-7.2cm/s

For more information on this visit

brainly.com/question/23366835

4 0
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