What is 115% of 270 ?

310.5

Step-by-step explanation:

To get the solution, we are looking for, we need to point out what we know.

1. We assume, that the number 270 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 270 is 100%, so we can write it down as 270=100%.

4. We know, that x is 115% of the output value, so we can write it down as x=115%.

5. Now we have two simple equations:

1) 270=100%

2) x=115%

where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

270/x=100%/115%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 115% of 270

270/x=100/115

- we multiply both sides of the equation by x

- we divide both sides of the equation to get x

270/0.8695652173913=x

310.5=x

x=310.5

now we have:

115% of 270=310.5

right

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15