Suppose angle a is complementary to angle b, and angle b is supplementary to angle c. if measure of angle a is 21 degree, find measure of angle c.

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?

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.