MATHEMATICS MIDDLE SCHOOL

How do you solve 3(m + 5 + 9m)

Answers

Answer 1

Answer:

Answer:

30m+15

Step-by-step explanation:

First, collect the like terms: 3(10m+5)

Next, multiply the numbers inside the brackets with 3:

3*10m=30m

3*5=15

So the answer is 30m+15

Answer 2

Answer:

Answer:30m+5

Step-by-step explanation:

3(m+5+9m)

3m+15+27m

30m+5

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There are 4 more girls in Mrs. Pitt's class than Mr. Brown's class. Five girls moved from Mrs. Pitt's class to Mr. Brown's class. Now there are twice as many girls in Mr. Brown's class as there are in Mrs. Pitt's. How many girls were in Mr. Brown's class to begin with?

If 18 is 45% of a value, what is that value

Answers

45% of 40 =18 so the answer would be 40.

How many hours are in 186 minutes explained in as a mixed number or decimal

Answers

there are 60 minutes in 1 hour

and 186 divided by 60 = 3 remainder 6
which means you have 3 hours and 6 minutes

that will get you the mixed fraction of
3 6/60 which can be simplified to
3 1/10

What is the area of the shaded reigon? Round to the nearest hundredth.

Answers

Area of full circle = πr^2

= 3.14 * 12^2

=3.14 * 144

=452.16 cm^2

Area of rectangle = l x w

= 10 * 3

= 30 cm^2

Area of shaded region:

452.16 - 30 = 422.16 cm^2

Why do fractions need to have a common denominator before you add or subtract them?

Answers

The denominator of a fraction tells you the relative size of thepieces. For instance, 1/2 is bigger than 1/4 because it only takes 2pieces to make a whole, as opposed to 4 pieces to make a whole. Onemight connect the need for a common denominator to the need for havingcommon units before adding or subtracting (you wouldn't add 12 inches to12 feet and get 24 for an answer). Therefore, the reason fractions needa common denominator before adding or subtracting is so that the numberof pieces you are adding/subtracting are all the same size. By the way,the numerator of a fraction just tells you how many pieces you have ofthat size.

Fractions need to have a common denominator because it tells how many pieces the whole is divided into. If one whole is divided into two parts, and another whole the same size is divided in to three parts, one out of the two parts will not be the same size as one out of the three parts.
If we use a common denominator, it ensures each piece is the same size.

Put -4, 6.2,18 1/2, -5.9,21, -1/4 and 1.75 in greatest to least order

Answers

okay lets do this

first we write these numbers on a peice of paper.

the answer is

21, 18 1/2, 6.2, 1.75, -1/4, -4, -5.9

if you need more help just tell me

21, 18 1/2, 6.2, 1.75, -1/4, -4, -5.9

Is (2,2) a solution to x+y=4 and 5x+5y=20?