Find the weighted average.A student earned grades of 80, 85, 78, and 79 on her four regular tests. She earned a grade of 79 on the final exam and 86 on her class projects. Her combined homework grade was 85. The four regular tests count for 40% of the final grade, the final exam counts for 30%, the project counts for 10%, and homework counts for 20%. What is her weighted mean grade? Round to one decimal place.
A. 82.1
B. 80.2
C. 81.5
D. 81.7
Answer: C
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Determine whether the collection is well-defined.The collection of the best cleaners.
A. Well-defined B. Not well-defined
Solve the equation for y.x - 5y = 4
A. y = 
x - 4
B. y = 
x - 
C. y = 5x - 4
D. y = x - 
List the intercepts and type(s) of symmetry, if any.y = 
A. intercept: (0, 0)
symmetric with respect to y-axis
B. intercept: (0, 0)
symmetric with respect to x-axis
C. intercept: (0, 0)
symmetric with respect to origin
D. intercepts: (
, 0), (-
, 0), (0, 0)
symmetric with respect to origin
Solve.If the force acting on an object stays the same, then the acceleration of the object is inversely proportional to its mass. If an object with a mass of 10 kilograms accelerates at a rate of 
per second per second by a force, find the rate of acceleration of an object with a mass of 
that is pulled by the same force.
A. 10 meters per second per second B. 5 meters per second per second C. 20 meters per second per second D. 18 meters per second per second