Solve.At a local zoo, adult visitors must pay $3 and children pay $1. On one day, the zoo collected a total of 
. If the zoo had 420 visitors that day, how many adults and how many children visited?
A. 135 adults and 285 children
B. 180 adults and 240 children
C. 270 adults and 150 children
D. 150 adults and 270 children
Answer: D
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State if the vectors a and b are perpendicular, parallel, or neither. If a and b are parallel, state whether they point in the same direction or in opposite directions.a = 
, b = 
A. Parallel, opposite directions B. Parallel, same direction C. Perpendicular D. Neither
Perform the indicated operations and write the result in standard form.
A. -7 - i
B. 7 + i
C. -7 + i
D. -7 + i
Solve the problem using the quadratic formula.When water runs out of a hole in a cylindrical container, the height of the water in the container can often be modeled by a quadratic function. Assume that the height of the water in a particular metal can with a small hole can be modeled by h(x) = 0.0003x2 - 0.17x + 8, where x is the time (sec) and h is the height (cm). Use the quadratic formula to estimate the earliest time when the height is 6 cm. Round your answer to the nearest second.
A. 19 sec B. 16 sec C. 18 sec D. 12 sec
Find the volume. Use ? ? 3.14 when needed.
A. 55.50 cm3 B. 229.500 cm2 C. 229.500 cm3 D. 18.8 cm3