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(5x - 10)
(3x + 40)
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answer:

  ∴ ( 5 x - 10) ( 3 x + 40) = 15 x² + 170 x -400

step-by-step explanation:

( 5 x -10) (3 x + 40)

= 15 x² + 200 x - 30 x - 400

  = 15 x² + 170 x - 400

  ∴ ( 5 x - 10) ( 3 x + 40) = 15 x² + 170 x -400

180 square centimeters

step-by-step explanation:

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.