If she pushes the bar 10 times in 20 seconds, how much power did she use?

b. 2

step-by-step explanation:

the slope of a line =δy/δx

δy= y₂-y₁

δx= x₂-x₁

therefore, using the points (-2,-3)   and (3,7) we can calculate gradient as follows:

m=(7--3)/(3--2) (a number minus a negative number the sign changes to a plus)

m=(7+10)/(3+2)

=10/5

=2

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225