Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

help plzzz

1. (x3)5

Ax-15

Bx2

Cx8

Dx15

Ex-2

Fx-8

2. (x-3)5

Ax-15

B1/x15

Cx2

Dx-2

Ex15

Fx-8

3. x-2/y-4

Axy-2

B(xy)-2

Cxy2

Dxy4

E(xy)2

Fy4/x2

4. (4x2)-1

A16x-2

B4x-2

C1/16x2

D(4x)-2

E1/4x2

F16x2

5. (2/5x-2)-3

A125/8x6

B-8/125x6

C8/-125x6

D(125x6)/8

E125/-8x6

F125/8x-6

6. The planet Earth weighs 6.6 x 1021 tons. Write this number in standard notation.

AIt is already in standard notation

B13.86 * 10

C138.6

D1386

E6,600,000,000,000,000,000

F6,600,000,000,000,000,000,000

7. Venus is 67,000,000 miles from the sun. Write this number in scientific notation.

A6.7 x 107

B67 x 106

C670 x 105

D6700 x 104

E67,000 x 103

FIt is already in scientific notation.

8. Multiply the following numbers using scientific notation: (2 x 103)(2 x 104).

A2 x 107

B4 x 107

C4 x 1012

D4 x 101

E4 x 1034

F2 x 1012

9. Divide the following numbers using scientific notation: (4 x 102)/(1 x 103)

A5 x 105

B4 x 101

C4 x 105

D4 x 10-1

E5 x 101

F5 x 10-5

10. Perform the following calculation: (1 x 102)(2 x 103)/(1 x 102)

A4 x 103

B3 x 103

C2 x 104

D2 x 103

E2 x 101

F1 x 102

11. How many centimeters are in two kilometers? Give your answer in scientific notation.

A2 x 102

B1 x 105

C2 x 105

D2 x 103

E1 x 102

F3 x 102

12. How many grams are in 4,247 mg? Give your answer in standard notation.

A42.47

B4.247

C42

D4247

E424.7

F424

13. How many microliters are in a two liter bottle of soda? Write your answer in scientific notation.

A1 x 103

B1 x 106

C2 x 103

D2 x 105

E2 x 106

F3 x 104

14. Examine the following solution to a conversion problem. Do you see a mistake? If so, identify the location of the first mistake and explain why it is incorrect.

AThe conversion is not possible.

BThe first problem occurs in column (1). The problem should begin with mg.

CThe first problem occurs in column (2). 1 kg is not equal to 1000 g, so that should not be used as the conversion factor.

DThe first problem occurs in column (2). The conversion factor is upside down (grams should be on top, and kg should be on bottom).

EThe first problem occurs in column (4). The multiplication and division was performed incorrectly.

FNo mistakes.

15. Examine the following solution to a conversion problem. Do you see a mistake? If so, identify the location of the first mistake and explain why it is incorrect.

AThe first problem occurs in column (1). The problem should begin with cm.

BThe first problem occurs in column (2). 1 m is not equal to 1000 mm, so that should not be used as the conversion factor.

CThe first problem occurs in column (2). 1 m is not equal to 1000 mm, so that should not be used as the conversion factor.

DThe first problem occurs in column (4). The multiplication and division was performed incorrectly.

ENo mistakes.

FThis conversion is not possible.

16. Examine the following solution to a conversion problem. Do you see a mistake? If so, identify the location of the first mistake and explain why it is incorrect.

AThe first problem occurs in column (4). The multiplication and division was performed incorrectly.

BThe first problem occurs in column (3). Using scientific notation for one conversion factor, but not the other, is not allowed.

CThe first problem occurs in column (2). The units are not equal, so that should not be used as the conversion factor.

DThe first problem occurs in column (1). The problem should begin with cm.

EThis conversion is not possible.

FNo mistakes.

17. Examine the following solution to a conversion problem. Do you see a mistake? If so, identify the location of the first mistake and explain why it is incorrect.

ANo mistakes.

BThe conversion is not possible.

CThe first problem occurs in column (1). The problem should begin with L.

DThe first problem occurs in column (4). The multiplication and division was performed incorrectly.

EThe first problem occurs in column (3). We are not allowed to use a conversion factor of (1 L/ 1L).

FThe first problem occurs in column (2). 1 L is not equal to 1000 kL, so that should not be used as the conversion factor.

18. Estimate the length of a pen in centimeters.

Aabout 1 cm

Babout 2 cm

Cabout 5 cm

Dabout 13 cm

Eabout 23 cm

Fabout 30 cm

19. Estimate the amount of juice in a typical orange juice carton in liters.

Aabout 8 liters

Babout 5 liters

Cabout 4 liters

Dabout 3.5 liters

Eabout 2 liters

Fabout .5 liters

20. Estimate the weight of a small can of soup in grams.

Aabout 30 grams

Babout 500 grams

Cabout 250 grams

Dabout 325 grams

Eabout 750 grams

Fabout 100 grams

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Hi;

For number 1, I can not understand most of that.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

ooh its saying to the power of i got c for the first one

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

ooh its saying to the power of i got c for the first one

One, who adopts patience, will never be deprived of success though it may take a long time to reach him. Imam ali (as)<3

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Oh, I get it.

1) C is correct. You could put some spaces in there. Powers like x squared are written like this x^2 instead of x2.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

for 2 i got c for 3 i got 4 and i need help for the rest

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Hi;

If this is what 2) is:

Then C is incorrect! Try again please.

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

tha -3+5=2

x2

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

the*

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Hi;

When you raise an expression to a power you are really doing this:

So the exponent is (-3)+(-3)+(-3)+(-3)+(-3) = -15

**In mathematics, you don't understand things. You just get used to them.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

so 2 is a

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Hi;

Yeparoo! I hate to scare you but b is correct too!

**In mathematics, you don't understand things. You just get used to them.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

i really need help in 3 4 5 please

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Hi

3. x-2/y-4

Axy-2

B(xy)-2

Cxy2

Dxy4

E(xy)2

Fy4/x24. (4x2)-1

A16x-2

B4x-2

C1/16x2

D(4x)-2

E1/4x2

F16x25. (2/5x-2)-3

A125/8x6

B-8/125x6

C8/-125x6

D(125x6)/8

E125/-8x6

F125/8x-6

3) F

4) E

5) A

**In mathematics, you don't understand things. You just get used to them.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

#3- x^ -2/ y^-4

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Hi;

Did them already, check post #14

**In mathematics, you don't understand things. You just get used to them.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

and for 6 i got a

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

thanx

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

for 7 i got 67*10^6

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Please hold on. For 6, what did your teacher tell you about standard notation?

**In mathematics, you don't understand things. You just get used to them.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

oooh so is it when i write the 6.6 and then 21 zeros to the right since its a positive

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Nope, I do not think so. I think you write it without the decimal point. Right now it is in scientific notation.

**In mathematics, you don't understand things. You just get used to them.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

6. The planet Earth weighs 6.6 x 1021 tons. Write this number in standard notation.

AIt is already in standard notation

B13.86 * 10

C138.6

D1386

E6,600,000,000,000,000,000

F6,600,000,000,000,000,000,000

so its f

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,927

Wunderbar!

**In mathematics, you don't understand things. You just get used to them.**

Offline

**zee-f****Member**- Registered: 2011-05-12
- Posts: 1,220

?????? am confused

Offline