Please help

x = 34°

Step-by-step explanation:

To find the value of x, we can subtract all the known angles from the total 360.

A straight angle is 180°. So, we can take this off from 360° for a remaining half of 180°.

Now, we only have the top half of the diagram. From this 180°, we know there is 100°, so we can subtract 100° from 180° for a remaining 80°. This means that (x + 12) plus x is equal to 80°.

We will subtract 12° from 80°, for 68°. x + x = 68°. Divide this remaining value to find the value of x by itself. = 34.

x = 34°

Check this by adding together (34 +12), 100, and 34.

34 + 12 + 100 + 34 = 180

We can be sure this is correct.

So, the answer is x = 34°.

I hope this helps ^^

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

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