MATHEMATICS MIDDLE SCHOOL

What are the property's for (1.) n times 1=n


(2.) 4 times m = m times 4


(3.) {x + 2} + 5 = x + {2 +5}

Answers

Answer 1
Answer: 1. Multiplicative Identity Property

2. Commutative Property of Multiplication

3. Commutative Property of Addition

Hope this helped! :D

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The sum of three consecutive even numbers is 78. what is the first number

Answers

This is a common algebra problem. Let us start by establishing the numbers. By the way, here is the theory behind the math. 

If we call the first number n, then the next consecutive even number is 2 away, so we will call it n+2, and so forth, the 3rd number n+4

Lets form an equation! We know that given the sum of the 3 consecutive even numbers is 78, the equation is:

n+(n+2)+(n+4)=78

Combine like terms, and we get: 

3n+6=78

Subtract 6 from both sides.

3n=72

Divide both sides by 3, and we find our number to be: 

n=24

Hope this helped! Good luck. 
x+(x+2)+(x+4)=78\n3x+6=78\n3x=78-6\n3x=72\n \nx= (72)/(3) \n \nx=24

The first number is 24

On her science test, Shawn correctly answered 66 out of 78 questions. What percent of the questions did she answer correctly?

Answers

To figure out percetages on tests, divide the number of questions answered correctly by the total number of questions. 

66 ÷ 78 = 0.85

Next, move the decimal point over two places.

0.85 = 85%

Shawn got 85% on the science test. 

Hi there! ;) The answer to your question is 0.85 or 85%. I got the answer because I divided 66/78(66 divided by 78) which equals 0.845 but I rounded it because 5,6,7,8,9 means round up.

Hope I helped! :D

Help with this math question ASAP Plz

Answers

sales-expense=netprofit
sales=147000+354000=501000
expense=204000+2ndyear
netrofit=87000

so

50100-(204000+2ndyear)=87000
minus 501000 both sides
-(204000+2nd year)=-414000
multiply both sides by -1
204000+2nd year=414000
minus 204000 both sides
2nd year=210000

answer is A

Photo attached! 10 points! Thank you in advance!!

Answers

ax^2+bx+c=0\n\nx^2+7x+9=3\qquad|\text{subtract 3 from both sides}\n\nx^2+7x+9-3=3-3\n\n\boxed{x^2+7x+6=0\to A.}

a=1,\ b=7,\ c=6

The answer is A because you subtract 3 from both sides to get the equation set to 0

Please help with this question and explain it. :) ty in advance.

Answers

So first we add the total pounds of harvested crop by the total number of hours:
48/24 which is 2
So 2 pounds of crop is harvested every hour, assuming that the working is constant throughout all four workers. 
So:
Employee - 
A: 12 pounds
B: 8 pounds
C: 12 pounds
D: 16 pounds

Which is a correct first step for solving this equation?
- 3x + 2 – 5x - 7 = 4x + 2

Answers

Answer:

x = -7/12

Step-by-step explanation:

- 3x + 2 - 5x - 7 = 4x + 2

- 8x - 5 = 4x + 2

- 8x - 4x = 2 + 5

- 12x = 7

x = 7/-12

x = -7/12
Circle your variable
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