The sum of two numbers is 40. The second number is 5 less than twice the first number. Let x represent the first number and let y represent the second number. What is the value of the first number? Use the table to guess and check.
Numbers
Х
у
x+y=40
y=2x-5
15
20
25
30

What is the value of x? enter your answer in the box. photo attached.

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.

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