Which of the following is an even function?

a) f(x) = (x – 1)^2

b) f(x) = 8x

c) f(x) = x^2 – x

d) f(x) = 7

Which three lengths could be the lengths of the sides of a triangle? 21 cm, 7 cm, 7 cm 9 cm, 15 cm, 22 cm 13 cm, 5 cm, 18 cm 8 cm, 23 cm, 11 cm

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Pleas ! its urgent! what is the value of x? enter your answer in the box. mm