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The answers are published data, survey, and observational study in that order on elearning for anyone still wondering.
Answer:
1)
A. <em>x</em> = 85/7
I used the formula length = area divided by width to get a.
2)
B. <em>w </em>= 85.6/12
I used the formula width = area divided by length to get b.
To solve for a variable, you need to get it (x) by itself.
x² - 14 + 31 = 63 Add 31 to -14
x² + 17 = 63 Subtract 17 from both sides of the equation
x² = 46 Square root both sides
x =

Check your work by plugging in

for x and then

.

² - 14 + 31 = 63 Square

46 - 14 + 31 = 63 Subtract 14 from 46
32 + 31 = 63 Add
63 = 63

² - 14 + 31 = 63 Square

46 - 14 + 31 = 63 Subtract 14 from 46
32 + 31 = 63 Add
63 = 63
So,
x is
and 
.
On average he will earn: $ 84 500 / 24 = 3520.83333 US. dollars = $3520.83333 ~ $3500.00.