10.2 x 2 = 20.40
9.4 x 3 = 28.20
Total= 48.60
Answer:
look at the picture i have sent
Your good its 80 one way you can always tell if its a triangle is if all the angles add up to 180
The domain: D={-3;-2;-1; 1}
f(x) = -x + 4
subtitute
f(-3) = -(-3) + 4 = 3 + 4 = 7
f(-2) = -(-2) + 4 = 2 + 4 = 6
f(-1) = -(-1) + 4 = 1 + 4 = 5
f(1) = -1 + 4 = 3
Answer: The range: {3; 5; 6; 7}