Solve by the substitution method.y = 4x + 32x + y = 21
A. {(15, 3)}
B. {(2, 11)}
C. {(3, 15)}
D. {(15, -9)}
Answer: C
Mathematics
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Provide an appropriate response.How do you know that f(x) = -3ex is concave down over every interval of x-values?
What will be an ideal response?
Mathematics
Use the formula d = rt to find the value of the missing variable.d = 264 miles, r = 66 mph
A. t = 5 hr
B. t = 
hr
C. t = 3 hr
D. t = 4 hr
Mathematics
Solve.How much commission will an agent make on the sale of a $111,500 house if she receives 
of the selling price?
A. $743.33 B. $7433.33 C. $1672.50 D. $167.25
Mathematics
Write the expression as the sine, cosine, or tangent of an angle.
A. tan
B. tan (5x - 3y)
C. tan (5x + 3y)
D. tan
Mathematics