Can someone check and see if i got the right answer on these problems

(1) is correct.

(2) is correct. I assume you just computed the dot product as above, but another way to do it is to notice that (that is, the dot product of a vector with itself is the square of its magnitude). Then since , we have .

(3) is not correct. Since , we have .

(4) is correct.

answer rather than having to add and subtract the measurements of the semi-circle, notice that the semicircle to the left of ad is actually identical in area to the blank semicircle-shaped space to the left of bc. so if we transferred the red semicircle into the blank space, we would end up with a square of side length 24 cm. the area of a square is s^2 = 24^2 = 676 cm^2.

u also answered this so i think u would know but i am here to

put in or use mine