What is the next three terms for 7, 21, 63

You eat 8 strawberries and your friend eats 12 strawberries from a bowl. there are 20 strawberries left. which equation and solution give the original number of strawberries?

1) what is the measure of the exterior angle, ∠uvw ? 2) in triangle man, what is the measure of the exterior angle at n (in degrees)?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?