Mathematics is not my strong suit for this one. I would appreciate your solutions to this answer. Plane A was 26,000 feet in the air and descending at a rate of 2800 feet per minute. Plane B took off from the ground ascending at 2400 feet per minute. Write an equation to represent the height (y) of each plane in terms of the number of minutes (x). At how many minutes will the planes be the same height, and what is that height?

After five minutes the plane is at 10,000. feet.

Step-by-step explanation:

f = feet above ground

r = rate of descent

m = minutes

f = 30000 - r · m

f = 30000 - 20000m

After five minutes:

f = 30000 - 2000(5)

f = 30000 - 10000

f = 20000

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.