What are the solutions for the given vector problem?

[Gattz]

Homework Statement

In a meeting of mimes, mime 1 goes through a displacement d1 = (2.79 m)i + (3.53 m)j and and mime 2 goes through a displacement d2 = (-6.75 m)i + (5.3 m)j. What are (a)|d1 × d2|, (b)d1 · d2, (c)(d1 + d2) · d2, and (d) the component of d1 along the direction of d2?
Give your answers in standard SI units.

Homework Equations

vectors a dot b = a_xb_x + a_yb_y + a_zb_z

The Attempt at a Solution

I got part a and c, but not b and d.

For part b isn't it (-18.8)(1) + 0 + 0 + (18.7)(1) = -.1? I don't know what part d is asking for.

 

[tjbateh]

For Part B i got -18.83i +18.71j

 

[tjbateh]

sorry did not realize my answer was the same as yours!

 

[Gattz]

Haha, no problem. The thing is I have to enter the answers on the computer, but apparently my answer is wrong.