The equation y = 35.25x + 40 gives the labor cost y of repairing a car if it takes x hours to repair the car. Which statement is true?
For every hour of labor, the cost decreases by $40.
For every hour of labor, the cost decreases by $35.25.
For every hour of labor, the cost increases by $40.
For every hour of labor, the cost increases by $35.25.
Stacey Warren - Expert brainly.com
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I believe its D.
Are you sure?
The equation y = 4.75x + 20 gives the cost y of towing a car if the car is towed x miles.
According to the model, what is the best estimate of the cost for towing a car 22 miles?
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Well its not negative so it wouldn't decline, and 40 doesn't represent the hourly cost so yeah. lol cx
thanks! can you help with the other question?
\[\large y = 4.75x + 20\]
where 'x' is the number of miles...so since we want to know the cost to go 22 miles we have
\[\large y = 4.75(22) + 20\]
\[\large y = 104.5 + 20\]
\[\large y = 124.5\]
Yeah. Briefly. The answer for the second is 104.50
4.75(22) = 104.50
...close...but there is a constant added after that
so that is not the answer?
*refers to my post above :)
would it be 124?
The correlation coefficient (r) between the number of miles driven x and the number of gallons of gasoline used y is 0.925.
What percent of the variation in the number of gallons of gasoline can be explained by differences in the number of miles driven?
Oh i forgot about the 20.. Yeah, John's right. lolol.
Most of these questions are easy you just plug in numbers for x or y and then just add or subtract or whatever.
okay what about that ^^^
Oh didn't see a reply
So the correlation coefficient r = 0.925
What we need for variability is R^2 ...so .925^2 = 0.8556
And multiply that by 100 to get the percent which is 85.6%