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3 years ago

I NEED HELP ON THIS PLEASE!!!!!!!

Mathematics

2 answers:

vlabodo [156]3 years ago

7 0

Answer:

Step-by-step explanation:

professor190 [17]3 years ago

6 0

The answer is B 25$

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How to solve the question

Scorpion4ik [409]

You have the equations set up correctly. I will use r and b as the variables to make it easier to follow.

12r + 8b = 70
20r + 12b = 110

First let's solve one of the equations for one of the variables.

12r = 70 - 8b

$r = \frac{70-8b}{12}$

Now plug that in for r in the second equation.

$20( \frac{70-8b}{12})+12b = 110$

Simplify

$20(70-8b)+144b=1320$

$1400-160b+144b=1320$

$-16b = -80$

b = 5 grams

Now plug 5 in for b in one of the original equations to find r.

12r + 8(5) = 70

12r = 30

r = 2.5 grams

So the red marbles weigh 2.5 grams, and the blue marbles weigh 5 grams.

3 0

3 years ago

Karla had $138.72 in her checking account. She wrote checks for $45.23 and $18. Then she made a deposit for 75.85 into her accou

vampirchik [111]

Answer:

$151.34

Step-by-step explanation:

First, Karla starts with $138.72.

Then Karla writes checks for $45.23 and $18.00. This means the money will be withdrawn, so let's subtract these from the total.

$138.72 - $45.23 - $18.00 = $75.49

Now, Karla has $75.49 in her account.

However, a $75.85 deposit is made to her account. So let's add this back to the total.

$75.49 + $75.85 = $151.34

So after all the transactions, Karla has $151.34 in her checking account.

5 0

3 years ago

The rectangular prism shown is made up of unit cubes. Each unit cube has a length of one inch, a width of one inch, and a height

algol13

Answer:

cube" (and any subsequent words) was ignored because we limit queries to 32 words.

3 0

3 years ago

Which number can each term of the equation be multiplied by to eliminate the decimals before solving? –m + 0.02 + 2.1m = –1.45 –

poizon [28]

since the 2 in 0.02 is in the hundredths place, you need to multiply that by 100 to eliminate the decimal, then you would need to multiply the other numbers by 100 as well

Answer is D) 100

7 0

3 years ago

Read 2 more answers

There are 1200 students in a school. 1/5 of the students are majoring in science. Of the science majors 30% are biology majors.

Trava [24]

There are 48 students majoring in Marine Biology.

4 0

4 years ago