MATHEMATICS MIDDLE SCHOOL

There are two approaches to solving the equation -3x + 10 = 4x - 20Subtract 4x from both sides. OR Add 3x to both sides.
-7x + 10 = –20 OR 10 = 7x - 20
Solve the equation using both approaches.
What is the solution?

Answers

Answer 1
Answer:

Answer:

You can take this equation into two approaches.

#1 subtracting 4x from both sides:

-3x+10=4x-20 (subtract 4x from each side)

-7x+10=-20 (then subtract 10 from each side)

-7x=-30 (then divide by -7 to get x by itself)

x=30/7

#2 Add 3x to both sides:

-3x+10=4x-20 (Add 3x to both sides)

10=7x-20 (then add 20 to each side)

30=7x (divide both sides by 7)

30/7=x

Either way you do it you will get x=30/7 as your answer.

Hope this helps ;)
Answer 2
Answer:

Answer:letter c x=30/7

Step-by-step explanation:

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at west mdle school there are 420 students who eat lunch the school lunch line always offers pizzas on Friday if 65% of students purchased pizza Friday the how many pizza lunches were purchased

Answers

Answer:

273

Step-by-step explanation:

What is the value of each digit in this number 58

Answers

the value of the 5 in 58 is 50
the value of the 8 in 58 is 8
50 + 8 = 58
5 is in the tens place so it would be 50 then you have the 8 which is in the ones place which would just be 8 ones

What happens when you move to the left of a decimal point?

Answers

If you move left of a decimal point, that means that the number is decreasing like for example:
45.89 to a decimal point - 4.589

I hope this helped!
When you move a decimal point to the left n times, the number becomes 10^n times smaller.

Isabella solved the following equation: 4x − 2x + 8 = 6(x + 4) Step Work Justification 1 4x − 2x + 8 = 6x + 24 Distributive Property 2 2x + 8 = 6x + 24 Combine like terms 3 −4x + 8 = 24 Addition Property of Equality 4 −4x = 16 Subtraction Property of Equality 5 x = −4 Division Property of Equality Which step has an incorrect justification?

Answers

Answer:

step 3 has incorrect justification.

Step-by-step explanation:

because it was combine like terms but 8 is still in left hand side. So,combine like terms 3 has incorrect justification.

Answer:

Step 3

Step-by-step explanation: Combine like terms but 8 is still in the left side, so combine like terms 3 has incorrect justification.

Can you please help me on problem 4 and 5 of my teacher created problem.

Answers

4. Area of a disk of diameter D : A= \pi*(D/2)^2\approx3.14*(3.5)^2=38.465

Assuming that you use the usual convention of rouding 5 to the greater number : 

A=38.47

5. Diameter of a circle of radius r : A= \pi D=47 hence D\approx47/3.14\approx14.97

how many minutes is it before 12 noon if 20 minutes ago it was three times as many minutes after 9 am

Answers

First, change everything into minutes.
12 noon is 12 by 60 which = 720 minutes.
9am is 9 by 12 which = 540 minutes.
X is now your number of minutes before noon.So noon - x is the next step:
720 - x
20 minutes ago it was 720 - x - 20
720 - x - 20= 540 + 3x (3x because you're looking for 3 times as many minutes)
720 - 20 - 540=4x (you combine all the like numbers and variables) 
160 = 4x
160/4= x
40 = x
Your answer is 40 minutes
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