Trevor spent $27 and now has no money left. He had $___ before his purchase. He had $__before his purchase

Simone claims the initial value and y-intercept are the same thing on a graph. is she correct? if you know that a line has a slope of and a y-intercept of 7, what is the equation for that line in slope-intercept form?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Emily is entering a bicycle race for charity. her mother pledges $0.90 for every 0.75 mile she bikes. if emily bikes 18 miles, how much will her mother donate?