Two cards are dealt without replacement from a well shuffled deck of cards. Find the probability that the first card is a seven or a king.
What will be an ideal response?
2 / 13
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Solve.How much 12% alcohol solution should be mixed with a 4% alcohol solution to get 30 liters of 8% alcohol solution?
A. 15 L of 12%, 15 L of 4% B. 18 L of 12%, 12 L of 4% C. 20 L of 12%, 10 L of 4% D. 9 L of 12%, 21 L of 4%
Solve the problems.A quality-control inspector examined 210 calculators and found 15 of them to be defective. At this rate, how many defective calculators will there be in a batch of 14,490 calculators?
A. 69 B. 5 C. 1,035 D. 3,150
Use the properties of logarithms to evaluate the expression without the use of a calculator.2log24
A. 2 B. 1 C. 4 D. 8
Find the focus and the directrix of the parabola.x = -2y2 + 4y - 7
A. Focus: (-7, -5); directrix: x = -3
B. Focus: 
; directrix: x = - 
C. Focus: 
; directrix: x = - 
D. Focus: (11, -5); directrix: x = 9