Solve the problem. Round your answer, if appropriate.One airplane is approaching an airport from the north at 140 km/hr. A second airplane approaches from the east at 265 km/hr. Find the rate at which the distance between the planes changes when the southbound plane is 30 km away from the airport and the westbound plane is 21 km from the airport.
A. -534 km/hr
B. -133 km/hr
C. -400 km/hr
D. -267 km/hr
Answer: D
Mathematics
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Determine whether the ordered pair is a solution for the given equation.y = 9 - x, (4, 5)
A. Yes B. No
Mathematics
Solve for x using an equivalent exponential expression.Find the area of a rectangle that measures 2 inches by 7 feet. Give the area in square inches and in square feet.
A. 168 sq in.; 
sq ft
B. 216 sq in.; 1
sq ft
C. 1
sq in.; 168 sq ft
D. 168 sq in.; 1
sq ft
Mathematics
Convert the units using unit fractions.6
hr = 
min
A. 390
B. 
C. 156
D. 
Mathematics
Solve the problem.Evelyn measured two rooms of her apartment and found that she needed 80.8 square meters of wallpaper for one room and 39.6 square meters for the other. How much wallpaper did she need?
A. 120.5 m2 B. 120.4 m2 C. 130.4 m2 D. 240.8 m2
Mathematics