Which expression represents the phrase, "half the sum of 10 and a number"?
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The answer is 1/2(10 + x).

The sum is the result after addition and to get the half of any value you can multiply it by 1/2.

For instance,

2 + 2 = 4.

4 is the sum

4 * 1/2 = 4/2 = 2

4 is essentially half of what is used to be.

Now that we know this,

(10 + x)

We can take half of that quantity. So our new expression looks like: 1/2(10 + x)

a) t'(-3, 6) and v'(0, 3)  

step-by-step explanation: