Use a graphing calculator to find the sum.
Round your answer to three decimal places.
A. 31.000
B. 6.200
C. -6.300
D. -4.133
Answer: B
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Multiply.(10 - 11r)(10 + 11r)
A. 100 - 220r - 121r2 B. 100 - 121r2 C. 100 - 11r2 D. 100 + 220r - 121r2
Solve the problem.Find an equation for the level surface of the function f(x, y, z) = x + ey+z that passes through the point 
.
A. x + ey+z = 67 B. x + ey+z = 20 C. x + ey+z = 63 D. ln(x) + y + z = 67
Solve the problem.The amount of a radioactive substance present, in grams, at time t in months is given by the formula 
Find the number of grams present in 3 years. If necessary, round to three decimal places.
A. 3103.691 B. 2.202 C. 310.369 D. 0.220
Find the domain of the variable in the equation. Write the answer in interval notation.
= 
A. (-2, 4) ? (4, ?) B. (-?, 2) ? (2, 4) ? (4, ?) C. (-?, -2) ? (-2, 4) ? (4, ?) D. (-?, -2) ? (4, ?)