Solve the problem.The following scatter diagram shows heights (in inches) of children and their ages.Height (inches)
Age (years)What happens to height as age increases?
A. Height stays the same as age increases.
B. Height and age do not appear to be related.
C. Height decreases as age increases.
D. Height increases as age increases.
Answer: D
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Find the mass of the wire that lies along the curve r and has density ?.C1: r(t) = (4 cos t)i + (4 sin t)j, 0 ? t ? 
;C2: r(t) = 4j + tk, 0 ? t ? 1; ? = 3t3
A. 2?3 units
B. 
units
C. 
?3 units
D. 
units
Write the quotients with positive exponents.
A. -4x2 B. 4x10 C. 4x2 D. -4x10
Use Cramer's rule to solve the system.0.3x + 0.08y = 122x - y = -100
A. ? B. {(300, 400)} C. {(400, 300)} D. {(3, 4)}
Determine the x- and y-intercepts of the graph of the quadratic equation.y = x2 + 4x - 7
A. x-intercepts: none; y-intercept: -7
B. x-intercepts: 1 - 
, 1 + 
; y-intercept: -7
C. x-intercepts: -2 - 
, -2 + 
; y-intercept: -7
D. x-intercepts: -1 - 
, -1 + 
; y-intercept: -7