Pre-Algebra

1)(6.0 × 10 to the 5th power) × (3.0 × 10 to the 4th power)

A) 18 × 10 to the 20th power.
B) 18 × 10 to the 9th power.
C) 1.8 × 10 to the 20th power.
D) 1.8 × 10 to the 9th power.


2)(5 × 10 to the -2 power) ÷ (2 × 10 to the 3rd power)

A) 2.5 × 10 to the -5 power.
B) 2.5 × 10 to the -1 power.
C) 2.5 × 10 to the 1st power.
D) 2.5 × 10 to the 2nd power.


3)(2.56 × 10 to the 6th power) × (3.56 × 10 to the 2nd power)

A) 9.1136×10 to the 12th power.
B) 91.136×10 to the 8th power.
C) 9.1136×10 to the 8th power.
D) 91.136×10 to the 12th power.


4) In a recent near, the population of California was about (2.52 × 10 to the 7th power) people. It's land area is about (4.05 × 10 to the 5th power) Km to the 2nd power. What has the average number of people per square kilometers?

A) 0.62 × 10 to the 5th power.
B) 6.2 × 10 to the 1st power.
C) 0.62 × 10 to the 14th power.
D) 6.2 × 10 to the 9th power.

  1. 0
  2. 0
  3. 36
asked by Audrey
  1. A math tutor will be able to check your answers once you post them.

    1. 0
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    posted by Writeacher
  2. 1. When multiplying, add the exponents:
    6*10^5 * 3*10^4 = 18*10^9.

    2.

    3. 2.56*10^6 * 3.56*10^2 = 9.1136*10^8.

    4. When dividing, subtract the exponent in the denominator from the
    exponent in the numerator:
    2.52*10^7/4.05*10^5 = 0.62*10^2 = 6.2*10^1.

    1. 0
    2. 0
    posted by Henry

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