Solve the problem. Write all linear equations in slope-intercept form.A driver wants to gauge the fuel efficiency of her vehicle at speeds of 30 mph and above. She notices that traveling at an average speed of 45 mph results in a rating of 39 mpg, whereas at an average speed of 50 mph, her car rates 29 mpg. Find a linear equation to model the gas mileage y for an average speed of x mph. Find the slope-intercept form of the equation of the line.
A. y = - 2x + 129
B. y = 
x + 51
C. y = - 2x + 51
D. y = 
x + 129
Answer: A
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Solve the problem.If sin ? = 0.5, find the value of sin ? + sin (? + 2?) + sin (? + 4?).
A. 1.5 B. 1.5 + 6? C. 0.5 D. 3.5
Assume that 0 < ? < ?/2. Find an expression for the indicated trigonometric function.Let x = 2 sin ? in 
. Find cos ?.
A. 
B. 
C. 
D. 
Solve the problem.A formula used to determine the velocity v in feet per second of an object (neglecting air resistance) after it has fallen a certain height is 
where g is the acceleration due to gravity and h is the height the object has fallen. If the acceleration g due to gravity on Earth is approximately 32 feet per second, find the velocity of a bowling ball after it has fallen 20 feet. (Round to the nearest tenth.)
A. 1280 ft per sec B. 35.8 ft per sec C. 25.3 ft per sec D. 6.3 ft per sec
Provide an appropriate response.Multiply two fractions by 
the numerators and 
the denominators.
A. multiplying; canceling B. adding; multiplying C. multiplying; multiplying D. multiplying; adding