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serg [7]
3 years ago
8

Which expression is equivalent to 7^3 * 7^-57a. 7^2b. 7^7c. 1/7^2d. 1/7^7​

Mathematics
2 answers:
nevsk [136]3 years ago
8 0

Answer:

c. (1/7^2) is the answer

Gnoma [55]3 years ago
3 0

Answer:

<h2><em><u>c. 1/7^2</u></em></h2>

Step-by-step explanation:

As,

{7}^{3}  \times  {7}^{ - 5}

=  {7}^{3 - 5}

=  {7}^{ - 2}

=  \frac{1}{ {7}^{2} }

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Tom arranged 3 groups of 4
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among 210 student 85 price in English 125 price in Nepali and 25 failed in both subject find the number of students who passed i
notka56 [123]

Answer:

210=85+125-x+25

x= 235-210

x=25 failled in both

Step-by-step explanation:

5 0
2 years ago
If you had $1,900,000, how many days would it take you to spend all if you spent $1 a second.
denis23 [38]
21.99 or 22 days
you just take 1900000 divided by 86400 and you get 21.99 or 22 days to spend the money
8 0
3 years ago
Please help with 1-9<br> 43 points
Paul [167]

Remark

I'll do two from each group, leaving you with 1. I just leave the answer for the one I don't do or a hint it it is long. That's more than we are instructed to do (which is three parts per posted question).

One

Two ratios form a proportion because they both equal the same thing when you reduce them to the point where the ratios are prime to each other.

3/4 = 12/16

3/4 can't be reduced any further. When both 12 and 16 are divided by 4, the result is 3/4

Two

<em><u>Formula</u></em>

Sale Price/Original Price = 3/4

<em><u>Solve</u></em>

Sale Price / 64 = 3/4           Multiply both sides by 64

Sale Price = (3/4)*64

Sale Price = 48

Three

682 Trillion atoms of hydrogen.

Four

<em><u>Formula</u></em>

rotations / 40 seconds = rotations / second

<em><u>Solve</u></em>

2000 / 40 seconds = rotations / 1 second    Just divide

50 rotations/1 second = rotations / second.

Five

<em><u>Formula</u></em>

Herd of cows / Total pounds of milk = 1 cow / pounds of milk

<em><u>Given</u></em>

Herd = 12

pounds total = 224998

<em><u>Solve</u></em>

12/224998 = 1 / x             Cross multiply

12x = 224998

x = 18750 pounds of milk for 1 cow.

Six

0.5 m in 1 second.

Seven

<em><u>Formula</u></em>

Pages / hour = pages / minute

pages / hour = 4.5

1 hour = 60 minutes.

<em><u>Solve</u></em>

4.5 / 1 hour. But 1 hour = 60 min

4.5 pages / 60 min = 0.075 pages per minute.

Note this is not a true proportion. You just have to know how it is done.

Eight

This is also not a true proportion. The best way to do this is called unit analysis.

\dfrac{18feet}{2seconds} * \dfrac{1 mile}{5280 feet}\dfrac{3600sec}{1hour}

Each set of units on the right will cancel with a set of units on the left until all that you area left with is miles / hour. Then just multiply the numerator numbers together and denominator numbers together.

numerator: 18 * 1 * 3600 = 64800

denominator: 2 * 5280 * 1 = 10560

Now divide the numerator by the denominator.

answer: numerator/denominator = 64800/10560 = 6.14 miles per hour.

Nine                                              

Note: there are 1760 yards in a mile.

1 gallon will take you 32000 yards or 18 miles. Do this the same way eight was done.

7 0
3 years ago
Read 2 more answers
Identify the word form of this number:<br><br> 795,860,913,789
oksano4ka [1.4K]

Answer: Seven Hundred Ninety-Five Billion Eight Hundred Sixty Million Nine Hundred Thirteen Thousand Seven Hundred Eighty-Nine

Step-by-step explanation: My head

4 0
3 years ago
Read 2 more answers
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