Is the square root of -4.23 repeating a rational number

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Complete the equation of the line through (−10,3) and (−8,−8). use exact numbers.

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$