If 0.34 < x < 0.40 and which of the following could be x?
Answer(s): C
5/16= 0.3125 and9/20= 0.45;3/8= 0.375 which is between 0.34 and 0.40, and between 0.3125 and 0.45.
A store prices a coat at $85. During a sale, the coat is sold at 20% off. After the sale, the store raises the price of the coat 10% over its sale price. What is the price of the coat now?
Answer(s): D
20% of $85 = (0.20) ($85) = $17.While on sale, the coat is sold for $85 $17 = $68; 10% of $68 = (0.10) ($68) = $6.80. After the sale, the coat is sold for $68 + $6.80 = $74.80.
The expression 4x2 2x + 3 is equal to 3 when x = 0 and when x =
Answer(s): E
Set the expression 4x2 2x +3equal to 3 and solve for x:
A spinner is divided into eight equal regions, labeled one through eight. If Jenna spins the wheel, what is the probability that she will spin a number that is less than four and greater than two?
Answer(s): A
There are three numbers on the wheel that are less than four (1, 2, 3), but only one of those numbers (3) is greater than two. The probability of Jenna spinning a number that is both less than 4 and greater than 2 is1/8.
The length of an edge of a cube is equal to half the height of a cylinder that has a volume of 160 cubic units. If the radius of the cylinder is 4 units, what is the surface area of the cube?
The volume of a cylinder is equal to r2h. The volume of the cylinder is 160 and its radius is 4. Therefore, the height of the cylinder is equal to:160 = (4)2h160 = 16hh = 10 The length of an edge of the cube is equal to half the height of the cylinder. The edge of thecubes5 units. The surface area of a cube is equal to 6e2, where e is the length of an edge of the cube. The surface area of the cube = 6(5)2= 6(25) = 150 square units.
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