Solve the problem.Suppose that a metal block is cooling so that its temperature T(in °C) is given by 
where t is in hours. How long has the cooling been taking place if the block now has a temperature of 100°C?
A. 1 hr
B. 2 hr
C. 8 hr
D. 4 hr
Answer: B
Mathematics
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Find the length and direction (when defined) of u × v.u = 5i, v = 3j
A. 5; 3k B. 15; 15k C. 15; k D. 15; -k
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If the Babylonian numeral 
stands for one and the Babylonian numeral 
stands for ten, then write the Babylonian numeral as a Hindu-Arabic numeral.
A. 50 B. 32 C. 5 D. 23
Mathematics
Factor the polynomial by grouping.10x2 - 4x - 25x + 10
A. (10x + 5)(x + 2) B. (2x - 5)(5x - 2) C. (10x - 5)(x - 2) D. (2x + 5)(5x + 2)
Mathematics
Find the intercepts for the equation.y = -x + 5
A. x-intercept: (5, 0); y-intercept: (0, 5) B. x-intercept: (0, 0); y-intercept: (0, 5) C. x-intercept: (2, 0); y-intercept: (0, 3) D. x-intercept: (5, 0); y-intercept: (0, -5)
Mathematics