If you were going to write this as an equation it would be like this. 4*5. Of you are look for the answer the answer is 20. Hope that helped.
We can re-write the equation √(1-x) - 2y = 2 → - 2y = 2 - √(1-x)
→ 2y = - 2 + √(1-x) → and y = [ - 2 + √(1+x)]/2
Tis function "exists" as long as the radical is > or = to zero:
1+x > or = 0 → x>-1
{x ∈ R for x> =0}
WORK:
D-5c
40-5(4)
20
Answer: 20
HOPE THIS HELPS
66 is 3x 22 so multiply the sales tax at 22$ by 3 or 1.87 * 3