Simplify the complex fraction completely.
A. 
B. 
C. 
D. 
Answer: D
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Use a proportion to solve the problem.A bag of fertilizer covers 2000 square feet of lawn. Find how many bags of fertilizer should be purchased to cover a rectangular lawn 90 feet by 230 feet.
A. 1035 bags B. 104 bags C. 11 bags D. 10 bags
Solve the problem.An electrician charges a fee of $55 plus $40 per hour. Let y be the cost in dollars of using the electrician for x hours. Find the slope-intercept form of the equation.
A. y = 55x + 40 B. y = 40x + 55 C. y = 40x - 55 D. y = 55x - 40
Find the equation of the line satisfying the given conditions, giving it in slope-intercept form if possible.Through (-6, -3), perpendicular to -3x - 4y = 30
A. y = 
x + 15
B. y = 
x + 5
C. y = 
x
D. y = - 
x - 5
Solve the problem.John (whose line of sight is 6 ft above horizontal) is trying to estimate the height of a tall oak tree. He first measures the angle of elevation from where he is looking as 35°. He walks 30 feet closer to the tree and finds that the angle of elevation has increased by 12°. Estimate the height of the tree rounded to the nearest whole number.
A. 90 ft B. 67 ft C. 86 ft D. 61 ft