Its 30 you find the unit rate by 21÷7 which equals 3 then you multipy 3x10 which gives you 30
4(x - 8) = (2)(5)
4x - 32 = 10
4x = 42
x = 10.5
The initial amount in the account was $200 (y intercept). She adds $32.50 each day to her bank account (slope).
Consider the right triangle ABC with legs AB=4, AC=3 and hypotenuse BC=5. Angle B has

and

.
Since O lies in second quadrant

and

.
Answer:
.