Donna Preski works 8 hours a day, 5 days a week. So far this year she has worked 680 hours. How many weeks has she worked?

She worked 17 weeks

Step-by-step explanation:

5 days = 1 week

8 hours = 1 day

8 x 5 = 40 hours per week

680 hours ÷ 40 hours per week = 17 weeks

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!