What is the value of 8^2?
The exponent of a number says how many times to use the number in a multiplication. In 82 the "2" says to use 8 twice in a multiplication, so 82 = 8 × 8 = 64
What is the value of 8x-6 when X= -1 ?
To perform this, you will simply substitute (-1) for the value of X. (8 x (-1)) - (6) = -14
What is the difference between their/there/they're?
There indicates a place as in, "I live here not there." It is the opposite of here. Their is the possessive of they, as in "They live there but it isn't their house." Here you want to indicate that the house belongs to them.