Solve.
= 
A. {15, - 1}
B. {- 15, 3}
C. {15, - 21}
D. ?
Answer: A
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Use the two steps for solving a linear programming problem to solve the problem.A chemical company must use a new process to reduce pollution. The old emits 7 g of sulphur and 14 g of lead per liter of chemical made. The new emits 2 g of sulphur and 3.5 g of lead per liter of chemical made. The company makes a profit per liter of 
under the old and 
under the new. No more than 13,701 g of sulphur and no more than 10,598 g of lead can be emitted daily. How many liters of chemical could be made under the old and under the new to maximize profits? Let x represent the
number of liters produced under the old process and y represent the number of liters produced under the new process. A. 0 liter(s) under old process and 3028 liter(s) under new process B. 0 liter(s) under old process and 2928 liter(s) under new process C. 1093 liter(s) under old process and 2928 liter(s) under new process D. 3028 liter(s) under old process and 1093 liter(s) under new process
Divide.
A. x2 + 2x + 
B. x2 + 2 + 
C. x2 + 2
D. x2 + 2x + 1
Solve the problem.A volunteer wants to crochet beach hats and baby afghans for a church 
bazaar. She needs 2 hours to make a hat and 5 hours to make an afghan and she has 10 hours available. Write an inequality that describes the situation and use the inequality to decide whether she can make 7 hats and 2 afghans in the time allowed. Let x represent the number of hats and y the number of afghans that she makes.
A. 2x + 5y ? 10; yes B. 2x + 5y ? 10; no C. 2x + 5y ? 10; no D. 2x + 5y ? 10; yes
Simplify the expression.z0 + 70
A. 0 B. z + 7 C. 2 D. 8