3 years ago

Help quick I need help it’s a quiz

Mathematics

1 answer:

natta225 [31]3 years ago

7 0

<h2>Solution :</h2>

Option d :

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Sara is 9 years younger than her brother, Michael. The sum of their ages is 47 years. How old is Sara and how old is her brother

kotykmax [81]

Answer:

Michael is 38 and Sara is 29

Step-by-step explanation:

Because it says the sum of their age is 47 you do 47-9=38 so that would be Michael's age and than because Sara is 9 years younger than him and then you would do 38-9=29

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2 years ago

Caitlin has $5 and $10 bills that are worth $675. She has twice as many $10 bills as $5 bills. How many of each type of bill doe

Lerok [7]

Caitlin has 27 $5 bills and 54 $10 bills.

Step-by-step explanation:

Given,

Worth of $5 and $10 bills = $675

Let,

Number of $5 bills = x

Number of $10 bills = y

According to given statement;

5x+10y=675 Eqn 1

She has twice as many $10 bills as $5 bills.

y=2x Eqn 2

Putting value of y from Eqn 2 in Eqn 1

$5x+10(2x)=675\\5x+20x=675\\25x=675$

Dividing both sides by 25

$\frac{25x}{25}=\frac{675}{25}\\x=27$

Putting x=27 in Eqn 2

$y=2(27)\\y=54$

Caitlin has 27 $5 bills and 54 $10 bills.

Keywords: linear equation, substitution method

Learn more about substitution method at:

#LearnwithBrainly

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3 years ago

-3x + 12x ...........

elixir [45]

-3x + 12x would be 9x.

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2 years ago

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An investment earns 11% simple interest. What amount of principal is needed to have $4500 after 6 years? Round your answer to th

soldier1979 [14.2K]

Answer:

Step-by-step explanation:

Formula =P×R×T=I

P×11/100×6=4500

66/100p=4500

100/66×66/100=4500×100/66

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3 years ago

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Answer:

the second one, B

Step-by-step explanation:

This is because in both numbers the decimal was moved back one.

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