I'll give brainliest if you show your work. mia’s work to find the slope of a trend line through the points (3, 10) and (35, 91) is shown below. mia's work step 1: 3-35/ 10-91 step 2: -32/ -81 step 3: 32/ 81 what was the first error that mia made? mia simplified incorrectly and made the slope positive. mia subtracted in the wrong order. mia switched the numerator and the denominator. mia used subtraction instead of addition.

Mia switched the numerator and the denominator.

Step-by-step explanation:

The slope formula is given by:

Where we have two ordered pairs:

P1 = (x1, y1)

P2 = (x2, y2)

Given is : Mia’s work to find the slope of a trend line through the points (3, 10) and (35, 91)

Step 1:

If we compare the formula with Mia's step, we can see that she switched the numerator and the denominator.

Hence, the error made is : Mia switched the numerator and the denominator.

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2