The answer is a, but explain how you got the answer.

You can see that the function crosses the x axis at x= -2 and x=5.

With this knowledge, we can justify the answer in more than one ways. For example, a polynomial with such roots is

Alternatively, we know that in a quadratic equation in the form

s is the sum of the roots and p is their product. In our case, the sum is 3 and the product is -10, so again we come to the conclusion that the equation is

50 min

step-by-step explanation:

they will be decreasing both their times in half

60 / 2 = 30

40/2 = 20

30 + 20 = 50

if x decreases by 4 then y increases by 10

step-by-step explanation: