MATHEMATICS MIDDLE SCHOOL

2. Find the value of each variable.
(1 point)
(y + x)
2xx(y-2)
2. Find the value of each variable. (1 point) (y - 1

Answers

Answer 1
Answer: i think u just set them equal to each other

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Dr. florenz needs 25 grams of salt for each student to do an experiment. she has 1.2 kilograms of salt on hand. she has a total of 128 students. how much more salt does she need?
What is the slope of the graph of 2x – 6y = 9? A.1/3 B.-1/3 C.3 D.-3
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How would i write 19.07 as a mixes number

What is the slope of the line A.-3 B. -3/4 C.3/4 D.4

Answers

point (0,2)  (4,-1)

slope = (y2-y1)/(x2-x1)

m= ((-1-2))/(4-0)

m=-3/4

Choice B

(0,2) and (4,-1)

Slope

m = (2 + 1)/(0 - 4)

m = -3/4

Answer

B. -3/4

Write a real world situation that could be modeled by the equation 650 + 10m = 60m + 400

Answers

two really fast cars are accelerating differently how long would it take for car a to catch up to car b

2z-18-4z=-8 what is the value of z

Answers

\bold{Hey\ there!} \n \bold{Simply\ both\ sides\ of\ your\ equation\downarrow} \n \bold{2z+(-4z)+(-18)=-8} \n \bold{Now, \ you \ have\ to \underline{Combine\ your\ like\ terms}\downarrow} \n \bold{\bullet \ 2z\ \& \ -4z}\n \n \bold{2z+(-4z)=-2z}\n \bold{-2z-18=-8}\n \bold{Nextly,\ you\ have\ to\ \underline{add}\ by\ 18\ on\ your\ sides\downarrow} \n \bold{-2z-18+18=-8+18} \n \bold{Cancel:-18+18} \n \bold{Keep:-8+18} \n \bold{\underline{Divide}\ by\ -2\ on\ your\ sides\downarrow}\n \bold{(-2z)/(-2)}\bold{= (10)/(-2)} \n \bold{Cancel: (-2z)/(-2)} \n \bold{Keep:(10)/(-2)} \n \n \boxed{\boxed{\bold{Answer: z=-5}}}\checkmark \n \n \n \bold{Good\ luck\ on\ your\ assignment\ \& \ enjoy\ your\ day!}\n \n \frak{LoveYourselfFirst:)}

Answer- z is equal to -5

Why is 6 is greater than 5/8 but less than 70

Answers

6 is a whole number and 5/8 is a fraction
Fractions are parts of a whole number
So a fraction is smaller than any whole number
Thats why 6 is greater than 5/8
6 is a number that is in the ones place
Once the ones place is full up the number 9 and is about to go to 10 it goes to the tens place
So anything that is in the tens place is greater than a number in the ones place
6 is in the ones place
70 is in the tens place
Thats why 6 is less than 70
6 is greatwr than5/8 but less than 70 because 5/8 isn't a whole number like 6 and is less than 70 because 7 is more than 5 and since 5/8 isn't a whole number it is less than 70

Solve for x algebraically; (2/3x)+(4/x)=(7/(x+1))

Answers

(2)/(3x) + (4)/(x) = (7)/(x+1) \n \nx\neq 0 \ \ and \ \x+1\neq 0 \n \nx\neq 0 \ \ and \ \x \neq -1

(2 )/(3x)+(4)/(x) = (7)/(x+1) \n\n\ (2+12)/(3x) = (7)/(x+1) \n \n(14)/(3x) = (7)/(x+1)\n \n14(x+1)=3x\cdot 7

14 x+14=21x \n \n14=21x-14x \n \n 7x=14 \ \ /: 7 \n \nx=2
 
(2)/(3x) + (4)/(x) = (7)/(x+1)

(2)/(3x) + (12)/(3x) = (7)/(x+1)

(14)/(3x) = (7)/(x+1)

Cross\ multiply :

14(x+1) = 7 * 3x

14x+14 = 21x

14x-21x =-14

-7x =-14

x = (-14)/(-7)

\boxed{x=2}

What is 3.25 repeating as a fraction

Answers

I assume you mean 3.25 repeating as in the .25 repeating, not just the 5 or something like that. Anyways, here's the solution:
Let x = 3.25 repeating
100x = 325.25 repeating on the 0.25 (you can do this by just moving the decimal place back 2 times, and since repeating decimals go on forever, it's like you just added another "2" and "5" to the front right behind the 3. But it is still mathematically correct. Anyways, we subtract 1x from both sides, but on the right side of the equation, we actually substitute the value of x in, so it would be 
100x-x on the left, and
325.25 repeating - 3.25 repeating on the right side.
On the left, 100x becomes 
99x
and on the right side, the repeating decimals cancel out to give you
322 (subtracting the 3 still)
so we currently have
99x=322
divide both sides by 99 to get
x = 322/99
which cannot be simplified, so the final fraction is
(322)/(99)
or
3 (25)/(99)
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