As i said before put the center instead of (h,k) in the general formula and put r=1
so (x-(-2))^2 + (y-(-5)^2 = 1
(x+2)^2 + (y+5)^2 = 1
They are telling you to make inches into feet
I foot equals 12 inches
84 divided by 12 equals 7
Answer is seven
Formula= cost price x rate of interest x time (years) and then divide by 100
You can first put into y=mx+b form so for the first one it would be y=-1/2x+3 3=y-intercept or where it'll touch the y-axis and -1/2 is the slope you can use the same approach for the next equation