Answer:
Tom hit 13 red targets!
Step-by-step explanation:
let hitting the red target bey x and blue target be y
then
5x+10y = 135
again
x+y=20
y=20-x
substituting the of y in above equation
5x + 10(20-x) = 135
5x+200-10x = 135
5x= 65
x= 13 answer
n=9
16
a=(-3.2)
a+(-1.3)=(-4.5)=a-1.3=(-4.5)
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Have a nice day.