Evaluate the expression for the given replacement values. Write the answer in simplest form.x + y for x = 
, y = - 
A. 
B. - 
C. - 
D. 
Answer: A
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Use Heron's formula to find the area of the triangle. Round to the nearest square unit.a = 5 inches, b = 12 inches, c = 9 inches
A. 23 square inches B. 21 square inches C. 49 square inches D. 51 square inches
Classify the system as independent, inconsistent, or dependent. x - 3y = 63y + 1 = x
A. Dependent B. Independent C. Inconsistent
Solve. Round to the nearest tenth when necessary.A flagpole casts a shadow of 39 feet, Nearby, a 7-foot tree casts a shadow of 5 feet. What is the height of the flag pole?
A. 1365 ft B. 27.9 ft C. 54.6 ft D. 0.9 ft
Solve.The inmedance Z in an alternating current circuit (like the one used in your home and in your classroom) is given by the formula Z = 
, where V is the voltage and I is the current. Find the value of Z if 
and 
A. 5 + 3i B. - 3 + 5i C. 3 - 5i D. -5 - 3i