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3 years ago

81 is 18% of what number?

1 answer:

7 0

The answer is: 450
First we need to see if we need to find the percent, part, or whole. In this case its the whole.
First, you set up a proportion: 18/100 = 81/x
Next, you cross multiply: 18x(8100)
Then, you divide: 8100÷18 = 450
So 450 is your answer.
Hope this helps! :D

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a machine factory produces 2 parts per second. one shift is 10 hours long. what is the production rate, in parts per shift? ente

seraphim [82]

The way to work out how many parts there are per shift would be as follows: if there are 2 parts produced every second, this means there are 120 produced every minute (60 times 2), and if you then multiply this 120 again to work out how many parts are made in an hour you will get 7,200. If you times this by 10 again you will get 72,000 parts made in a 10 hour shift.

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3 years ago

Read 2 more answers

What's the sum of 6(-2.1k - 2) + (7k + 5)

jok3333 [9.3K]

The sum of 6(-2.1k-2) + (7k+5) is -5.6k-7

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3 years ago

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Sophia puts $450 in an account earning 7% simple interest annually. How many dollars will she

maks197457 [2]

Answer:

Sophia will have $576 in her account after 4 years.

Step-by-step explanation:

450 × 0.07 = 31.50

31.50 × 4 = 126

450 + 126 = 576

8 0

3 years ago

Saige's spaceship traveled 588588588 kilometers (\text{km})(km)left parenthesis, start text, k, m, end text, right parenthesis i

lesantik [10]

Answer:

A is proportional

B and C are NOT proportional

Step-by-step explanation:

First, simplify 588 and 60:

588 divided by 6

60 divided by 6

= 98

Simplify them again by dividing them both by 2

= 49

Let's look at A:

441 and 45

Simplify by dividing by 9

= 49

It's pretty obvious that A is proportional because the simplified values are exactly the same.

Next, let's check B:

215 and 25

Simplify by dividing by 5

= 43

Now that its simplified you can compare

43 is smaller than 49

5 5

B is not proportional

Finally, let's check C:

649 and 110

Simplify by dividing by 11

= 51

Make 51 and 49 have the same denominator so we can compare them

10 5

51 can stay the same because 5 times 2 equals 10

49 times 2

5 times 2

= 98

Now that the denominators are the same we can compare

51 is much smaller than 98

10 10

Therefore, C is also not proportional.

Hope that helps :D

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3 years ago

Read 2 more answers

find the number of running and passing plays using substitution method 110 plays 3 yards per run 7 yards per pass total yards 37

Zinaida [17]

Let x be the number of running plays

Y be the number of passing plays

Since the total plays is 110

X + y = 110

And total yard is 378

3x + 7y = 378

Using the first equation

X = 110 – y and substitute to the 2nd equation

3(110 – y) + 7y = 378

And solve for y

Y = 12

Substitute to eqution 1

X = 110 – 12 = 98

7 0

3 years ago