.If x= 2 +√3 , find the value of x^2+1/x^2 and x^4+1/x^4

Dana wants to identify the favorite professional baseball team of people in her community. she stands outside a local sporting goods store and asks every other person who enters, "what is your favorite professional baseball team? " will the results of her survey be valid? explain.

47: 4 aisha changed 1.45 + 2.38 to 1.5 + 2.4 in order to estimate the sum. what estimation method did she use?

If a=0.333333 and b=0.55555, what is the value of a+b