Removing the variable led to an improved model even though R^2 decreased. Removing the variable led to a worse model because R^2 should always increase, regardless of what happened to s. Removing the variable led to a worse model because s should always increase, regardless of what happened to R^2.

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

Acable company wants to provide cell phone service for residents on an island. the function for the cost of laying the cable from the island to the mainland is c(x)= 6.500 square root x2+4, where x represents the length of the cable in feet. what are the domain and range of the function? a) domain: all real numbers range: all real numbers greater than or equal to 17,000 b) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 17,000 c) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 13,000 d) domain: all real numbers greater than or equal to 13,000 range: all real numbers greater than or equal to 0

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