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April 19, 2014

Homework Help: math

Posted by steve on Tuesday, September 25, 2012 at 7:16pm.

1. Rosa, Roberto, Andrea, and Inno find an estimate for the square root of 10. Who has proposed the best solution?

a. Rosa: "Use the sqaure root of 9 and the square root of 25 to estimate."
b. Roberto: "I will use the square root of 4 and the sqaure root of 9."
c. Andrea: "It should be the square root of 11 and the square root of 12."
d. Inno: "Use the square root of 9 and the sqaure root of 16 to find the estimate."


2. Joy knits a square blanket that has an area of 1,500 square inches. What is the approximate length of each side of the blanket?

a. 16 in.
b. 27 in.
c. 39 in.
d. 42 in.

3. An example of an irrational number is _____.

a. the negative square root of 17
b. the square root of 16
c. the negative square root of 9
d. the square root of 1

4. Which statement is true?

a. Every real number is an integer.
b. Every rational number is a real number.
c. Every rational number is a perfect square.
d. Every integer is an irrational number.

5. As estimate for the square root of 47 is between __________?

a. 4 and 5
b. 5 and 6
c. 6 and 7
d. 7 and 8

6. An estimate for the negative square root of 72 is _____.

a. -8.1
b. 8.5
c. 9.1
d. 9.5

8. When a skydiver jumps from an airplane, the distance d in feet the diver falls in t seconds before opening the parachute is given by the formula d = 16t^2. The formula assumes that there is no air resistance. Find the time it takes a skydiver to fall 1,551 ft before opening the parachute. Round to the nearest tenth.

a. 9.7 s
b. 9.8 s
c. 9.9 s
d. 2.5 s


9. What do you do to check whether a number is rational or irrational? In your explanation, use an example of an irrational and a rational number.

10. How does finding the square root of a number compare to finding the cube root of a number? Use the number 64 in your explanation

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