MATHEMATICS MIDDLE SCHOOL

Complete 2x+21= using only the communtative property of addition

Answers

Answer 1

Answer:

Answer:

-9.5

Step-by-step explanation:

2x + 21 =

2x + 20 = 1 (C.P)

2x = 1-20

2x = - 19

x= - 19/2

x = - 9. 5

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A machinist can produce 114 parts in 6 minutes.At this rate, how many parts can the machinist produce in 15 minutes?

Answers

114 parts / 6 min = X parts / 15 min

114/6 = x/15
cross multiply

114 * 15 = 6 * x

1710 = 6x
divide both sides by 6

1710/6 = 6x/6

285 = x

Hope this helps! (:

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Please answer the following, thanks!1. Jamal has 1,240 songs on his MP3 player, and 40% of the songs are rock songs. How many of the songs are NOT rock songs?

2. Rianda bought 32 apples. She set aside 25% to eat and divided the rest equally among 6 pies. How many apples are in each pie?

3. The math class has a set of 40 calculators, and 85% of the calculators have working batteries. How many calculators need new batteries?

Answers

Number 1 is 744 because if you minus the percentage form the number of songs you get the 744

PLZ HELP ME!!!!!!!!!

Answers

The building has 16 floors. To show your work: 193.6/12.1 = 16

A school has 1,200 students.if 65% of the students are girls , how many girls attend the school

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My answer is 1200 divided by 20 equals 60 and 60multiply by 13 equal 780 my answer is 780

Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy?

Answers

50% Because 2 people are there and if 1 is a boy there's a 50% chance that there's another boy. For example you had 2 gumballs in a gumball machine. You picked one up. There would be chances of picking up 1 of the other. So there's a 50% chance of picking a gumball. :D hope this helps.

Estimate the sum of 196 and 482