Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x + 0y = 90x + y = 4
A. x = 9; y = 4
B. x = 4; y = 9
C. x = 9; y = 2
D. x = 2; y = 
Answer: A
Mathematics
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Find the probability.Assuming that boy and girl babies are equally likely, find the probability that a family with three children has all boys given that the first two are boys.
A. 1
B. 
C. 
D. 
Mathematics
Find the x- and y-intercepts of f.f(x) = (x - 3)2(x2 - 25)
A. x-intercepts: -3, -25; y-intercept: 75 B. x-intercepts: -5, 3, 5; y-intercept: 225 C. x-intercepts: -5, 3, 5; y-intercept: -225 D. x-intercepts: 3, 25; y-intercept: 75
Mathematics
Using the horizontal-line test, determine whether the function is one-to-one.
A. one-to-one B. not one-to-one
Mathematics