Abaseball diamond is a square with side 90 ft. a batter hits the ball and runs toward first base with a speed of 30 ft/s.
(a) at what rate is his distance from second base decreasing when he is halfway to first base? (round your answer to one decimal place.)
(b) at what rate is his distance from third base increasing at the same moment? (round your answer to one decimal place.)

answer: she must produce at least 9,000 windows in order to make a profit of $48,000

explanation:

48,000 - 12,000 = 36,000

36,000/4 = 9,000

first option

a function is a relation in which an input is paired with exactly one output.

so, let's find the right answer.

in our first option, our inputs are january, february, and march. the outputs are 30, 28, and 25. each input has it's own output. this is correct!

our second option we know is incorrect, because ms. valverade has two outputs, dogs and cats. this is not a function.

our third option is incorrect as well. the yellow square has two ouputs, the square and the triangle.

lastly, in our fourth option, we see the number 7 two times with a different output. therefore, this is not a function.

remember: each input must be paired with only one output!