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C. A plane, currently flying at an altitude of 3000 m, ascends at a rate of 50 m per minute for 7 minutes.

Step-by-step explanation:

Explanation of why this is correct:

A says descends, which is negative, but the equation shows positive. Therefore, A is incorrect.

B says 57 when the equation is 50, and does not use the 7. Therefore, B is incorrect.

D says 57, does not include the 7, and uses negative when the equation is positive. Therefore, D is incorrect.

We are left with C. Let's check our work to make sure it is correct. It uses 50, like the equation.  It talks about the 7, like the equation. It is positive like the equation. There are no inaccuracies. Therefore, C is correct.

c

step-by-step explanation:

it would be see because your formula is f(x)=6x, so 6 times 1 is 6 and you go on and the best answer is c.

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm