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Ksju [112]
3 years ago
13

Helppppppppppppppppppppppppp

Mathematics
1 answer:
Solnce55 [7]3 years ago
8 0
Set the two expressions equal to each other.

7x + 3 = 9x

Simplify, isolate the x, subtract 7x from both sides

7x (-7x) + 3 = 9x (-7x)
3 = 2x

Set the equation = 0, subtract 3 from both sides

3 (-3) = 2x (-3)

0 = 2x - 3

2x - 3, or D, should be your answer

hope this helps
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twice the sum of x is at most 38. what is the greatest value of x that satisfies the inequality that represents this situation
Zolol [24]
<span>Twice the sum of x = 2x

2x </span>≤ 38
x ≤ 38 ÷ 2
x ≤ 19

Greatest value of x is 19
3 0
3 years ago
How many ounces of a 35% alcohol solution must be mixed with 10ounces of 40% alcohol solution to make a 37% alcohol solution?
spayn [35]
First off, let's change the format of the percentage to decimal.. so 35% is just 35/100 or 0.35 and 40% is 40/100 or 0.4 and so on.

\bf \begin{array}{lccclll}&#10;&amount&concentration&&#10;\begin{array}{llll}&#10;concentrated\\&#10;amount&#10;\end{array}\\&#10;&-----&-------&-------\\&#10;\textit{35\% sol'n}&x&0.35&0.35x\\&#10;\textit{40\% sol'n}&10&0.40&4.00\\&#10;-----&-----&-------&-------\\&#10;mixture&y&0.37&0.37y&#10;\end{array}

now, whatever "x" amount is, we know that x + 10 must add up to "y". x + 10 =  y, because both quantities added will give the mixture amount.

and whatever 0.35x + 4 = 0.37y, because both concentrated amounts must give the 37% of the mixture.

\bf \begin{cases}&#10;x+10=\boxed{y}\\&#10;0.35x+4=0.37y\\&#10;----------\\&#10;0.35x+4=0.37\left( \boxed{x+10} \right)&#10;\end{cases}

solve for "x", to see how much of the 35% solution will be needed.

what about "y"? well, x + 10 = y.
5 0
3 years ago
Sanjay graphs a quadratic function that has x-intercepts of –3 and 7. Which functions could he have graphed? Check all that appl
zvonat [6]
X-intercepts are found by factoring.  Use the quadratic formula on the first since it's in standard form and you find that your x values are in fact -3 and 7.  For the second one, use the Zero Product Property that says that x - 3 = 0 or x + 7 = 0.  Therefore, x = 3 and -7.  Signs are wrong.  So not the second one.  As for the third one, if you factor out a 3, your polynomial is exactly the same as the first one which did give us the desired x values.  So the third one checks out.  If you FOIL out the first one and then apply the quadratic formula you do get x = 3 and -7. So the fourth one checks out too.  For the last one, putting it into the quadratic formula gives you x values of 3 and -7, so no to that one.  Summary:  1st, 3rd, 4th have zeros of -3 and 7; 2nd and 5th do not.
6 0
2 years ago
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Need help WILL MARK BRAINLEST​
zimovet [89]

root 12 + 5 root 3

2 root 3 + 5 root 3

7 root 3

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2 years ago
The 20% tip on<br> a $42 meal
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Answer:

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3 0
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