Answer:
Step-by-step explanation:

Add the numbers 7 + 10
17 - 7j = -10 - 4j
subtract 17 from both sides
-7j = -27 - 4j
add 4j to both sides
-3j = -27
divide both sides by -3
j = 9
Finding the slope using two points:
The formula for slope is
In this case...
(-4, 3) and (5, 3)
^^^Plug these numbers into the formula for slope...

B. 0
^^^This is your slope
Hope this helped!
~Just a girl in love with Shawn Mendes
Answer: 15 boys
Explanation: ratio 5:7
5 + 7 = 12
Number of boys = 5/12 × 36