Charmaine purchased a prepaid phone card for $20.00. Calls cost 25 cents a minute using this card. The credit, C (in dollars), left on the card after it is used for
x minutes of calls is given by the following function.
C(x) = 20.00 -0.25x
How much credit is left on the card after Charmaine uses it for 40 minutes of calls?

The length of a rectangle plus its width is 25 cm. the area is 156 square cm. what are the length and width of the rectangle? separate the answers with a comma.

What is 5 kilometers turned into meters

Suppose you want to transform the graph of the function y=tan(x+pi/4)-1 into the graph of the function y=-tan(x+pi/2)+1 which transformations should you perform. a) reflect the graph of the first function across the x-axis, translate it pi/4 units to the left, and translate it 2 units up. b) reflect the graph of the first function across the x-axis, translate it pi/4 units to the right, and translate it 2 units up. c) reflect the graph of the first function across the line y = -1, translate it pi/4 units to the left, and translate it 2 units up. d) reflect the graph of the first function across the line y = -1, translate it pi/4 units to the right, and translate it 2 units up.