6. What is the tens' digit of the largest 4-digit even number which uses each of the digits 5, 7, 8, and 9 exactly once? A 9
B) 8
C) 7
D) 5

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15