6.a)Determine the value(s) of x if the angle between the vectors a = 3i - 4j + 2xk and b = -2i + 3j + xk is 90°

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students