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Dominik [7]
3 years ago
12

Solve each equation mentally​

Mathematics
1 answer:
Phoenix [80]3 years ago
5 0
1. x=2
2. X=100
3. X=100
4.-1
You might be interested in
-5x+y=-3
serg [7]
(3)(-5x+y=-3)
(5)(3x-8y=24)

-15x+3y=-9
15x-40y=120

3y=-9
-40y=120

-37y=111
Divide both sides by -37

y=-3

To solve for x. Choose one equation from the given and plug what you get in Y.

I'll choose, -5x+y=-3
So, -5x+(-3)=-3
-5x=0
Divide both sides by -5
x=0/-5

Hope, this helps.
5 0
3 years ago
4 - 5/2 * (1/10x) = 1 what is the value of x
Inga [223]

4 - 5 / 2 * (1/10x) = 1\\

The first step is to identify the order in which the equation must be solved, by following PEMDAS (you might know it as BEDMAS):

Parenthesis (or Brackets)

Exponents

Multiplication and Division

Addition and Subtraction

My advice would be to add parenthesis, following these rules, if you are not very good at finding them immediately by sight.

So:

4 - 5 / 2 * (\frac{1}{10x})  = 1\\\\4 - [(5/2)*(\frac{1}{10x})]=1\\\\4-(2.5*\frac{1}{10x})=1\\\\4-\frac{2.5}{10x}-1=0\\3-\frac{x}{4}=0\\\frac{x}{4}=3\\x=3*4\\x=12

We check our answer:

x=12\\4 - [(5 / 2) * (1/10)*(x)] = 1\\4 - [(5 / 2) * (\frac{1}{10}) * (12))] = 1\\4 - [2.5 * (\frac{1}{10})*12] = 1\\4 - [(\frac{2.5}{10})*12] = 1\\4 - [(\frac{1}{4})*12] = 1\\4 - 3 = 1\\1=1

We are right!

So, x=12.

6 0
3 years ago
Looking up, Felipe see two two hot air balloons in the sky shown. He determines that the lower hot air balloon is 515 meters awa
OlgaM077 [116]

Answer:

281.4

Step-by-step

This is the answer

5 0
2 years ago
What is the Surface Area and volume of this cylinder?
Dmitriy789 [7]

Answer:131

Step-by-step explanation:

hope this helps <3

3 0
2 years ago
Which expression uses the commutative property to make it easier to evaluate 1/6 • 5/7 • 18?
Korvikt [17]
It’s A, Because if you do KCF (Keep Change Flip) It would be 1/6 X 7/5.
8 0
2 years ago
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