Use a proportion to solve the problem.A recent advertisement claimed that 2 out of every 5 doctors recommend a certain herbal supplement to increase energy levels. If a local hospital employs 140 doctors, how many doctors would you expect to recommend the supplement? (Round to the nearest whole number, if necessary.)
A. 350 doctors
B. 28 doctors
C. 56 doctors
D. 1400 doctors
Answer: C
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Solve the system by the substitution method.x2 + y2 = 21y2 = 2x + 13
A. (2, 
), (-4, 
), (2, -
), (-4, -
)
B. (2, 
), (-3, 
), (2, -
), (-3, -
)
C. (3, 
), (-4, 
), (3, -
), (-4, -
)
D. (2, 3
), (-4, 3
), (2, -3
), (-4, -3
)
Solve the problem.An aircraft going from Atlanta to Savannah on a heading of N 119° E is travelling at a speed of 450 miles per hour. The wind is out of the north at a speed of 22 miles per hour. Find the actual speed and direction of the aircraft.
A. 445 miles per hour; 121° from north B. 629 miles per hour; 121° from north C. 461 miles per hour; 121° from north D. 440 miles per hour; 122° from north
Simplify the expression by removing as many factors as possible from under the radical. Assume that all variables represent positive real numbers.
? 
A. 2
B. 5
C. 10
D. 100
The supply equation is 
and the demand equation is 
. Find the equilibrium demand.
What will be an ideal response?