A blood bank needs 9 people to help with a blood drive. 12 people have volunteered. Find how many different groups of 9 can be f
1 answer:
You might be interested in
Answer:
w = -20
Step-by-step explanation:
- + 9 = 13
Shift the (+9) to the other side of the equation. (+9) will turn into (-9).
- = 13 - 9
= 4
Shift the (÷5) to the other side of the equation. (÷5) will turn into (×5).
-w = 4 × 5
= 20
Multiply both sides of the equation by (-1) so that -w will turn into w.
w = (-1) × 20
w = -20