Asked by Annoy
Help with some homework.
13. What is 3.56 x 10^-5 in standard form?
14. Which of the following appears to be an irrational number?
15. Which number is equivalent to 0.454545?
16. Riding the bus, Roger uses 1/3 of his money for bus fare. What is the fraction of his money expressed as a decimal?
17. Josh has 5/8 of a foot of plywood. To finish building the deck, he needs five times that amount. How many feet of plywood does Josh need?
18. -1/6 + (-3/7)=
19. 11/12 + (-2 /3)=
20. 10 5/18 - 8 5/6
21. 1/4 x -1/2
I'm super desperate, I have until midnight.
13. What is 3.56 x 10^-5 in standard form?
14. Which of the following appears to be an irrational number?
15. Which number is equivalent to 0.454545?
16. Riding the bus, Roger uses 1/3 of his money for bus fare. What is the fraction of his money expressed as a decimal?
17. Josh has 5/8 of a foot of plywood. To finish building the deck, he needs five times that amount. How many feet of plywood does Josh need?
18. -1/6 + (-3/7)=
19. 11/12 + (-2 /3)=
20. 10 5/18 - 8 5/6
21. 1/4 x -1/2
I'm super desperate, I have until midnight.
Answers
Answered by
Writeacher
If you’re expecting someone to hand you the answers, you’ve come to the wrong website. But if you actually want help, a math tutor might give up part of New Year’s Eve. No guarantees, though.
Answered by
Annoy
I understand, I'm just trying to get this done so I dont fail this semester and get kicked out of school. Sorry.
Answered by
Writeacher
Here’s something you can do now. Go to https://www.mathsisfun.com/ and click on Numbers. Then go into the Fractions menu, and you should find explanations and examples for some of your questions.
Answered by
Annoy
Thank you so much. I really appreciate this.
Answered by
Writeacher
You’re welcome.
There’s an Algebra section there, too, which you might find helpful.
There’s an Algebra section there, too, which you might find helpful.
Answered by
oobleck
#13: move the decimal place 5 to the left, filling in zeroes as needed
#14: ???
#15: when you have a group of repeating digits, place them over an equal number of nines. Thus
0.454545... = 45/99 = 5/11
Of course, you may have to adjust if there are leading non-repeating digits.
0.004545 = 0.01 * 0.454545 = 1/100 * 5/11 = 5/1100 = 1/220
0.23454545 = 0.23 + 0.00454545 = 23/100 + 1/220 = 129/550
#16: just do the division ... 1/3 = 0.3333...
#17: 5 * 5/8 = 25/8 = 3 1/8
#18: -1/6 + (-3/7) = -1/6 - 3/7 = -7/42 - 18/42 = -25/42
#19: 11/12 + (-2 /3) = 11/12 - 8/12 = 3/12 = 1/4
#20: 10 5/18 - 8 5/6 = 9 23/18 - 8 15/18 = 1 8/18 = 1 4/9
#21: 1/4 x -1/2 = -(1/4)(1/2) = -1/8
when multiplying fractions, multiply the tops and bottom, then simplify.
2/3 * 3/8 = 6/24 = 1/4
when dividing, multiply by the reciprocal of the divisor.
2/3 ÷ 3/8 = 2/3 * 8/3 = 16/9
If any of this is still unclear, you have some studying to do, yeah?
#14: ???
#15: when you have a group of repeating digits, place them over an equal number of nines. Thus
0.454545... = 45/99 = 5/11
Of course, you may have to adjust if there are leading non-repeating digits.
0.004545 = 0.01 * 0.454545 = 1/100 * 5/11 = 5/1100 = 1/220
0.23454545 = 0.23 + 0.00454545 = 23/100 + 1/220 = 129/550
#16: just do the division ... 1/3 = 0.3333...
#17: 5 * 5/8 = 25/8 = 3 1/8
#18: -1/6 + (-3/7) = -1/6 - 3/7 = -7/42 - 18/42 = -25/42
#19: 11/12 + (-2 /3) = 11/12 - 8/12 = 3/12 = 1/4
#20: 10 5/18 - 8 5/6 = 9 23/18 - 8 15/18 = 1 8/18 = 1 4/9
#21: 1/4 x -1/2 = -(1/4)(1/2) = -1/8
when multiplying fractions, multiply the tops and bottom, then simplify.
2/3 * 3/8 = 6/24 = 1/4
when dividing, multiply by the reciprocal of the divisor.
2/3 ÷ 3/8 = 2/3 * 8/3 = 16/9
If any of this is still unclear, you have some studying to do, yeah?
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