How is math used while working as an elevator and escalator installer and repairer?

b

step-by-step explanation:

given

- 2 (3x + 12y - 5 - 17x - 16y + 4 )

simplify the parenthesis by collecting like terms

= - 2 (- 14x - 4y - 1) ← distribute the parenthesis by - 2

= 28x + 8y + 2 → b

step-by-step explanation:

x=30

step-by-step explanation:

{3 + i, 3 - i, 3, -1}

step-by-step explanation: