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Elden [556K]
3 years ago
10

There are 21 groups of 3 in a room. How many people are there. I need an equation

Mathematics
2 answers:
saul85 [17]3 years ago
8 0
Y=3(x)
Where x represent the number of groups

Y=3(21)
Y=63

There will be 63 people in one room
Mars2501 [29]3 years ago
4 0
Y = 3(21)

21 would be x
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John invested $4,500 at 5.5% annual simple interest. His maturity value of his investment was $5,545. How long did John invest t
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John invested the money at simple interest for 4.22 years.

We have,

Invested amount = $ 4500

Rate of interest = 5.5 %

Time = t years

Maturity value = $ 5545

So,

Total interest earned =  $ 5545 - $ 4500 = $ 1045

And,

Simple interest = (Principal × Rate × Time ) / 100

So, Using the mentioned formula,

1045 = ( 4500 × 5.5 × t ) /100

1045 = 45 × 5.5 × t

⇒

t = (1045) / (45 × 5.5)

⇒ t = 4.22 years

Therefore, John invested the money at simple interest for 4.22 years.

Learn more about simple interest here:

brainly.com/question/22621039

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The line represented by the equation 2y - 3x = 4 has a slope of.....
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