<span>D. Can I write an equation to represent the problem situation is probably the best choice because it helps him visualize the problem in mathematical terms.</span>
The curve is y = sqrt{x}.
Replace x in the curve with 1 and then with 4 to find your point.
y = sqrt{1}
y = 1
First point (1, 1).
y = sqrt{4}
y = 2
Second point (4, 2).
Take it from here.
It would be the first choice, $20.
Remove parentheses by multiplying factors.
use exponent rules to remove parentheses in terms with exponents.
combine like terms by adding coefficients.
combine the constants.
the answer is 120.00 dollars