MATHEMATICS MIDDLE SCHOOL

3x+y=5
3y-z=2
X+z=5
Solve for x,y,z
Solve by Gaussian elimination

Answers

Answer 1
Answer:

Answer: x= 5/3 - y/3, y= 2/3 + z/3 z=5-X

think that's how you wanted it

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What's 9/25 as an equivalent fraction.
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The points (-3,4) and (5,-2) are on the graph of function f. If function g is the inverse of function f, what pair of points are on function g?

Answers

9,-5 if this is correct

Which us shorter 1/3 2/5 3/10 or 1/4

Answers

The shortest fraction is 1/4.

The common denominator is 60, so you see how much times the denominator can go into 40 and multiply the numerator by that much. For example 3/4 and the common denominator is 20. Four can go into 20 five times so you multiply 3 five times and the fraction is 15/20

Soup cost $10 for 3 cans. Josh spent $40 on soup. How many cans did he buy?

Answers

he bought 12 cans:) because if 3 cans are 10$ and he spent 40$ just multiply 4 (the 40 dollars)times 3 (the amount of cans you get per 10 dollars).Hope this helped!

Wayne has a recipe on a 3 inch by 5 inch index card that he wants to    enlarge to 15 inches long. How wide will the enlargement be?Also I'm really sorry for the people that I just put random things that's why there is more pts on this question once again I'm sorry for the random things that I put hope you guys would forgive me okay bye.

Answers

I'm not completely sure which way they would like for you to do it
but anyways

3 to 15 is a times 5
so 5 times 5 is 25
so a possible width can be 25
as in 15 by 25

or

5 to 15 is times 3
so 3 times 3 is 9
so a possible width can be 9
as in 15 by 9

I personally think 25 inches wide would be the better answer

How do you find a Mark-up or Mark-Down for retail prices? For example;Original price; $279.99, Mark-down: 75%. And can someone please show how its done? Thanks. :)

Answers

You take $279.99 x 75% then subtract what you you get from $279.99. This is is markdowns so for a mark up you add instead of subtracting.
Mark Up: Store pays $40 for shoes and sells to me for $75.calculate the markup in absolute terms 75 – 40 = 35. Narkup rate $40 (x)(40) so markup over the original price is 35 ÷ 40 = x = 0.875. It's a percentage so you need to use the decimal in the correct percentage which is 87.5%

Mark down: Original $425 marked down to $318.75. 425-318.75=106.25   ($106.25) is (some percent) of ($425) so 106.25 = (x)(425) and x = 106.25 ÷ 425 = 0.25. Use decimal to % form which is 25%

Harder than it looks…if you still don't understand let me know.

Do you know
10(55-1000)/90+2=?

Answers

The answer to the question is: No, but I could calculate it if that were necessary.
• We're starting by calculating the number in brackets: 55-1000 = - 945.
• Now , we have:

 • 10x (-945) : 90 + 2 =
= -9450: 90 + 2 =
= - 105 +2
= - 103 .
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