Please help me! I do not under stand any of this! I know i should do it on my own. but please help me!!
1.(6.0 x 10^5) x (3.0 x 10^4) = (1 point)
18 x 10^20
18 x 10^9
1.8 x 10^20
1.8 x 10^10
2. (5 x 10^–2) ÷ (2 x 10^3) = (1 point)
2.5 x 10^-5
2.5 x 10^-1
25 x 10^1
25 x 100^2
3. (2.56 x 10^6) x (3.56 x 10^2) = (1 point)
9.1136 x 10^12
91.136 x 10^8
9.1136 x 10^8
91.136 x 10^12
4. In a recent year, the population of California was about 2.52 x 10^7 people. Its land area is about 4.05 x 10^5 km2. What was the average number of people per square kilometer? (1 point)
0.62 x 10^5
6.2 x 10^1
0.62 x 10^14
6.2 x 10^9
*
5. What is the product of (5.1 × 10^3) • (3.2 × 10^3)? (1 point)
16.32 × 10^6
1.632 × 10^7
16.32 × 10^9
1.632 × 10^10
6. What is the product of (7.28 × 10^-2) • (9.1 × 10^-2)? (1 point)
6.6248 × 10^-3
66.248 × 10^-4
6.6248 × 10^4
66.248 × 10^-3
7. What is the quotient of (2.965 × 10^7) ÷ (5 × 10^3)? (1 point)
14.825 × 10^4
5.93 × 10^5
14.825 × 10^5
5.93 × 10^3
8. In a recent year, the world production of wheat was about 5.2 × 10^8 metric tons. Canada produced one over twenty-five of this wheat. About how much wheat did Canada produce? (1 point)
20.8 × 10^8
2.08 × 10^7
2.08 × 10^6
20.8 × 10^7
1. D
2 A
3. C
4. B
I need help with the population of California one. I know all of the rest.
ok, here are the rest. Looks like some review is in order.
when you multiply, you add powers. when you divide, you subtract powers. so
(5 x 10^–2) ÷ (2 x 10^3)
= 5÷2 x 10^-2 ÷ 10^3
= 2.5 x 10^-5
(2.56 x 10^6) x (3.56 x 10^2)
= 2.56x3.56 x 10^6x10^2
= 9.1136x10^8
population density is people/km^2, so we need to divide:
2.52 x 10^7 ÷ 4.05 x 10^5
= 2.52/4.05 x 10^7÷10^5
= 0.622x10^2
= 6.222x10^1
(5.1 × 10^3) • (3.2 × 10^3)
= 5.1x3.2 x 10^3x10^3
= 16.32x10^6
= 1.632x10^7
(7.28 × 10^-2) • (9.1 × 10^-2)
= 7.28x9.1 x 10^-2x10^-2
= 66.248x10^-4
= 6.6248x10^-3
(2.965 × 10^7) ÷ (5 × 10^3)
= 2.965/5 x 10^7÷10^3
= 0.593x10^4
= 5.93x10^3
5.2 × 10^8 x 1/25
= 5.2/25 x 10^8
= 0.208x10^8
= 2.08x10^7
(6.0 x 10^5) x (3.0 x 10^4)
= 6.0x3.0x10^5x10^4
= 18 x 10^9
= 1.8x10^10
do the others the same way.
multiply the numbers, add the powers of 10.
Then shift the decimal point at the end so the number is between 1 and 10.
Steve, I tried it that way but i never get the right answer! i'm still so confused.
Uhhhhhhhhhhhhhhhhhh...
I don't either.