Andrea’s work to find the equation of a trend line through the points (48, 61) and (72, 195) is shown below.

Andrea’s Work

Step 1

Step 2

Step 3

Step 4

What was the first error that Andrea made?

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

207/8 is the right

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.

a - base

b - exponent

so,