Answer
V=19
You put a +11 under the -11 then you can move the +11 to the other side of the equal sign. Then u add them which equals 19.
Answer:
D
Step-by-step explanation:
i did it with eliminating choices
√0.25 = 0.5
-√16 = -4
both are rational
Answer:

Or

Step-by-step explanation:
The given expresion is 2y-8+4y.
We want to find an expression that is equal to 2y-8+4y.
We need to group like terms to obtain:

We can now combine the like terms to get:


We can factor 2 to obtain:

Twice 2 to the 30-th power is
2*2³⁰ = 2¹*2³⁰ = 2³¹
For very large numbers, it is the usual practice to use scientific notation.
From the calculator, obtain
2³¹ = 2.1475 x 10⁹
Answer: 2.1475 x 10⁹