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MrRissso [65]
3 years ago
15

A school year ends the year with 651 students this is a 5% increase from the start of the school year. What equation could be us

ed to find the number of students where n represents students?
Mathematics
1 answer:
jeka57 [31]3 years ago
4 0
I assume you're trying to find either the amount of students that came or the amount from the beginning of the year. In order to do this 651*0.05= 32.55 (the amount of students that came(round it up)) To find the amount of students at the beginning of the year 651-32.55= 618.45 which would round down to 618. There were 33 students that came and 618 at the begging of the year.

651*0.05=32.55  651-32.55=618.45
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Radda [10]

Answer:

-1.23076923077

Step-by-step explanation:

7 0
3 years ago
How much pure acid should be mixed with 6 gallons of a 20% acid solution in order to get a 90% acid solution?
beks73 [17]
So, how much acid is there in 6 gallons?  well is 20% acid or (20/100), so the amount of acid in it just (20/100) * 6 or 1.2, the rest is say water.

now, if we want a 90% solution, and say we add "y" gallons, how much acid is in it?  well (90/100) * y, or 0.9y.

now let's add "x" gallons of pure acid, now, pure acid is just pure acid, so is 100% acid, how much acid is there in it?  (100/100) * x, or 1x or just x.

we know whatever "x" and "y" amounts are, they -> x + 6 = y

and we also know that x + 1.2 = 0.9y

\bf \begin{array}{lccclll}
&\stackrel{gallons}{acid}&\stackrel{acid~\%}{quantity}&\stackrel{acid~gallons}{quantity}\\
&------&------&------\\
\textit{pure acid}&x&1.00&x\\
\textit{20\% sol'n}&6&0.20&1.2\\
------&------&------&------\\\
mixture&y&0.90&0.9y
\end{array}
\\\\\\
\begin{cases}
x+6=\boxed{y}\\
x+1.2=0.9y\\
----------\\
x+1.2=0.9\left( \boxed{x+6} \right)
\end{cases}
\\\\\\
x+1.2=0.9x+5.4\implies x-0.9x=5.4-1.2\implies 0.1x=4.2
\\\\\\
x=\cfrac{4.2}{0.1}\implies x=\stackrel{gallons}{42}
3 0
3 years ago
6th grade math I mark as brainliest
Angelina_Jolie [31]

Answer:

C

Step-by-step explanation:

Hope this helps :)

4 0
3 years ago
Solve for |2x + 4|-1=7
Rudik [331]

Answer:

x = - 6 or x = 2

Step-by-step explanation:

The absolute value function always returns a positive value. However, the expression inside can be positive or negative.

Given

| 2x + 4 | - 1 = 7 ( add 1 to both sides )

| 2x + 4 | = 8, thus

2x + 4 = 8 ( subtract 4 from both sides )

2x = 4 ( divide both sides by 2 )

x = 2

OR

-(2x + 4) = 8

- 2x - 4 = 8 ( add 4 to both sides )

- 2x = 12 ( divide both sides by - 2 )

x = - 6

As a check

Substitute these values into the left side of the equation and if equal to the right side then they are the solutions.

x = 2 → | 4 + 4 | - 1 = | 8 | - 1 = 8 - 1 = 7 ← True

x = - 6 → | - 12 + 4 | - 1 = | - 8 | - 1 = 8 - 1 = 7 ← True

Hence the solutions are x = - 6 or x = 2

6 0
3 years ago
Anyone please help me hurry ????
Sergeu [11.5K]

Answer:

No, She is not correct.

Step-by-step explanation:

A reflection across the Y axis changes the X value.

If you look at point B and point B prime, the coordinates dont change at all. Which makes this incorrect, I believe.

7 0
3 years ago
Read 2 more answers
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