Solve the problem.The difference between a country's exports and imports is called the country's trade balance. If one country had a trade balance of -$87 billion one year, $131 billion the following year, and -$31 billion the third year, what was the total trade balance for these three years?
A. -249 billion dollars
B. 249 billion dollars
C. -13 billion dollars
D. 13 billion dollars
Answer: D
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A ball is tossed upward from the ground. The height H, in feet, of the ball after t seconds is given by
.
?
How long after the ball is tossed will it reach its maximum height? Round your answer to two decimal places.
?
A. 3.76 seconds B. 130.09 seconds C. 2.84 seconds D. 129.39 seconds
An algebraic expression is given. Use the expression to answer the following questions. a) How many terms are there in the algebraic expression? b) What is the numerical coefficient of the first term? c) What is the constant term? d) Does the algebraic expression contain like terms? If so, what are the like terms?7y + 1 + 8x
A. a) 3 b) 7 c) 1 d) yes, 7y and 8x B. a) 3 b) 7 c) 1 d) no C. a) 3 b) 8 c) 1 d) no D. a) 2 b) 7 c) 1 d) no
Decide if the given equation is a solution of the given differential equation.x + y = xy', y = x ln x + cx
A. No B. Yes
Use factoring to solve the equation.3k2 - 11k - 4 = 0
A. 
, - 
B. - 
, 4
C. - 
, 3
D. -3, 4