the circumference of a circle is 20π. what is the radius of this circle

Mike has coffee worth 4$ per pound that he wishes to mix with 20 pounds of coffee worth 7$ per pound to get a mixture that can be sold for 5$ per pound. How many pounds of the cheaper coffee should he use?

Adriana writes the equation y = 2x + 4 to represent a line on a graph. Henry writes an equation that has a y-intercept that is 1 unit lower on the graph but has the same slope as Adriana's line.

Are the ratios 25/45 and 15/27 proportional? Explain.

Subtract x + 6 from - 3x - 4. A) - 4x - 10 B) 4x + 10 C) - 2x + 2 D) - x + 10

Students are selling raffle tickets for a school fundraiser. They collect $25 for every 10 raffle tickets sold. Rain equation that reflects the relationship between m and r

Given that f (x) = x2 + 3x - 3; find f (4).

Ted walked 5/8 mile to his soccer game then he walked 3/8 mile to his friends house which distance is shorter

How do you factor 1-r^2

Elimination method using multiplication:3x+2y=0 and x-5y=17

Is - 4^2< (-4) ^2 a false statement