Solve the formula for the indicated letter.A = 
bh, for h
A. h = 
B. h = 
C. h = 
D. h = 
Answer: B
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Use a half-angle formula to find the exact value of the expression.cos 
A. - 
B. 
C. 
D. - 
Find the axis of the graph of the function.f(x) = (x + 7)2 - 5
A. x = 5 B. y = 7 C. y = 5 D. x = -7
Find a quadratic function that models the data.The table shows the population of a city in selected years. Data are in thousands rounded to the nearest hundred. YearPopulation (thousands)1970 78.21975 80.11980 85.31985 92.71990 103.81995 117.8 Let x = 0 correspond to 1970 and let f(x) be the population of the city (in thousands) in year x. Using the point 
as the vertex and and the data from 1995, determine a quadratic function 
that models the data.
A. f(x) = 0.06336x2 + 78.2 B. f(x) = 0.0792x2 + 78.2 C. f(x) = 0.3136x2 - 78.2 D. f(x) = 1.584x2 + 78.2
Evaluate x2, -x2, and (-x)2 for the following value of x.-1
A. x2 = 1; -x2 = 1; (-x)2 = -1 B. x2 = 1; -x2 = -1; (-x)2 = 1