Fill in the order form to get the price

3. if a=3i+4j+5k and b=2i+j+7k. Find a.b

a.45

b.40

c.30

d.35

4.What is the gradient of the straight line and the angle of inclination of the points, A(2, -3) and B(4, 5)?

a.gradient=1, angle = 30 degree

b.gradient=1, angle = 35 degree

c.gradient=1, angle = 45 degree

d.gradient=2, angle = 45 degree