Answer:
A. 31/100
Step-by-step explanation:
Change 3/10 to hundreds:
3/10 × 10/10 = 30/100
The denominator (the bottom number) must be 100.
61 - 30 is 31.
The missing number is 31/100. See image.
You want to isolate the variable on one side of the equation so that you can see what it's value is with respect to the other terms
Here is your equation:
You're trying to find x, and to do that, the variable must be alone. That means you need to cancel out everything with it. The only thing with the variable 12x is -5. To cancel that out, you have to do the opposite of it, which is +5. Add 5 to both sides.
12x(12 times x) is equal to 132. You need to find x. You have to do the opposite of times 12, which is divide by 12. Divide both sides by 12.
Your answer is x is equal to 11 ; x = 11
<em>If you have any questions, feel free to ask in the comments! :)</em>
The only way you have of finding the length of the missing side is
to ASSUME that the lengths of all 3 of them form a Pythagorean
triple. You know that you can go ahead and do this when you see
the little red 'corner' drawn in one vertex of the triangle. Then you
know that the angle is a right angle, the triangle is a right triangle,
and the sides form a Pythagorean triple.
Then (missing side) = √( 1.7² - 1.5²)
= √(2.89 - 2.25)
= √0.64 = 0.8 .
Without that little red box corner-symbol, there would be no way.
You would not stand a chance.