SECOND QUESTION
Check all the option by substituting the value of x and f(x) to the function
first option
f(x) = -10ˣ
f(x) = -10⁰
f(x) = -1
first option is not the right function. Because when x = 0, f(x) is not equal to 1.
second option
f(x) = 10ˣ
f(x) = 10⁰
f(x) = 1
third option
f(x) = 10²
the third option is not a function, because there's no x in the function
fourth option
f(x) = 1ˣ
the fourth option is not the right function, because any value of x will result f(x) equals 1.
THE ANSWER: SECOND OPTION
SECOND QUESTION
Check all the options
first option
f(x) = 1ˣ
The result of f(x) is always equal to 1, so the first option is not correct
second option
f(x) = 7²
it is not a function
third option
f(x) = -7ˣ
f(x) = -7⁰
f(x) = -1
the third option is not correct because when x = 0, the result of f(x) is not equal to 1
fourth option
f(x) = 7ˣ
f(x) = 7⁰
f(x) = 1
this is the correct one
ANSWER: FOURTH OPTION
THIRD QUESTION
Range of a function is equal to the value of f(x) or the value of y.
f(x) = (1/4)ˣ
the value of f(x) is always positive. Positive numbers (1/4) squared by any numbers always produce result f(x) in positive number too.
So the correct answer is f(x) > 0, in other word y > 0
ANSWER: FIRST OPTION
