Entered 9.015 Answer Preview Result 9.015 The answer above is NOT correct. (1 point) Use a linear approximation to estimate the number (27.07)2/3. Answer: 9.015 incorrect Entered Answer Preview Result (-13.3, 5, 13.3) incorrect The answer above is NOT correct. (1 point) Find a vector a that has the same direction as (-8, 3,8) but has length 5. Answer: a = (1 point) Find the following expressions if a = 2i - 5k, b = i + j 3k, and c = 1. a b = -2 2. a c= 3. b c = 4i + 5j + 2k.