The expression to go with the words is 2x6-9
Use distributive property:

Answer:
90 red cars, 150 blue cars
Step-by-step explanation:
Divide 240 by 8. 8 comes from the 3:5 ratio (3+5). 240/8=30. 30x3=90, 30x5=150.
Answer:
M ( -4,9)
Step-by-step explanation:
12b-15>21
+15 +15
12b > 36
----- ----
12 12
b = 3