SOLUTION: The formula y=2.6sqrtX +9 models the percent of U.S. adults who are considered obese by federal guidelines, where X is the number of years after 1980, and Y is the percent of obese

Question 425052: The formula y=2.6sqrtX +9 models the percent of U.S. adults who are considered obese by federal guidelines, where X is the number of years after 1980, and Y is the percent of obese adults. In this equation, Y is already converted from a decimal, so, for example, a 55% obesity rate would correspond to Y=55.
According to this formula, in what year was the obesity rate 15.4 percent?
Answer: In the year
Round to the nearest actual year.
Answer by htmentor(1343) (Show Source): You can put this solution on YOUR website!
Set y = 15.4 and solve for x:

Subtract 9 from RHS, divide by 2.6 and square both sides:
(6.4/2.6)^2 = x = 6.059 years after 1980.
Therefore, the year was 1986.
RELATED QUESTIONS
It is estimated that 30 percent of all adults in the United States are obese and that 3... (answered by ikleyn,math_tutor2020,greenestamps)

Suppose that 3% of all adults suffer from diabetes and that 28% of all adults are obese.... (answered by ewatrrr)

This graph needs to shift to the right by 7 units and the formula is... (answered by stanbon)

Suppose that 65% of all adults in a certain community are obese and that 59% suffer from... (answered by jim_thompson5910)

Suppose that 53% of all adults in a certain community are obese and that 46% suffer from... (answered by stanbon)

Suppose that 55% of all adults in a certain community are obese and that 36%... (answered by Boreal)

Suppose that 38% of all adults in a certain community are obese and that 37% suffer from... (answered by ikleyn)

find the indicated probabilities. about 30% of U.S. adults are trying to lose weight. you (answered by Boreal,ikleyn)

BMI in children is approximately normally distributed with a mean of 24.5 and a standard... (answered by ewatrrr)