Lena started to run on a treadmill after setting its timer for 78 minutes. The display says that she has finished 31% of her run. How many minutes have gone by? Round your answer to the nearest tenth.

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

Given that abcd is a rhombus, what is the value of x?

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32