Please solve I don't understand

Step-by-step explanation:

3. n - 8(9n + 5) = n - 72n + 40 = -71n - 40

4. 6b - 24b + 15 = -18b + 15

5. -x + 2 + 7x = 6x + 2

6. -50 - 40x + 7 = -40x - 43

7. 10 - 81 -90n = -71 -90n

8. -4a + 32 + 6a + 24 = 2a + 56

step-by-step explanation:

. your answer will contain x - and y -terms. (1 point) x ( ¿¿ 2 − 7 ) 2 +( y 2 − 9 ) 2 √ ¿ 12. what is the distance from the directrix (the crocodile river) to the point ( x , y )? write this equation. your answer will contain a y -term.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: