Which of the following is equivalent to 4(z2)?
Answer(s): C
z2 is equivalent to z × z.
How much water must be added to 1 liter of a 5% saline solution to get a 2% saline solution?
Answer(s): B
Use the equation (0.05) (1) = (0.02) x:the left side represents 5% of 1 liter; the right side represents 2% of some amount of water. From the equation, x = 2.5. Subtracting the 1 liter of water already present in the 5% solution, you will find that 1.5 liters need to be added.
What is another way to write 312?
Answer(s): A
The square root of 12 is the same as the square root of (4 × 3), which is the same as the square root of 4 times the square root of 3. The square root of 4 is 2. So 3 times the square root of 12 is the same as 3 times 2 times the square root of 3.
What is another way to write 2.25 × 1002?
1002 = (100)(100), or 10,000(10,000)(2.25) = 22,500
Choose the answer to the following problem: 107 ÷ 104?
In a division problem like this, leave the whole number the same and subtract the exponents.
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