You need to expand the brackets eg.
(w-9)8 basically means 8 x (w-9) = 8w-72
45 i believe it is i may be wrong!!!
Answer:
y=5 when x=20
Step-by-step explanation:
Using the format for inverse proportions: y=k/x
To find k, substitute 25 in for y and 4 for x to find:
25=k/4 ⇒ k=100
Using this we can substitute k and x in for 100 and 20 to find:
y=100/20 ⇒ y=5
-18 = xy + z
- z -18 = xy
-z-18/y = x
