I could figure out all of them except for part (d), I got 14.857... So I rounded

Question

I could figure out all of them except for part (d), I got 14.857... So I rounded up to 15 but I still got iy wrong. Can someone please help me on part (d) as soon as possible please?

7.0i + 7.9j and b = 7.9i+ 9.5j . Find (a) | a x J. Find (a) a x b, (b) a .b, Two vectors are given by a = and (d) the component of along the direction of ? (a) Number4.1 (b) Number 130 (c) Number 280 (d) Number15. This answer has no units Units This answer has no units Units This answer has no units Units This answer has no units Units

Explanation / Answer

The component of a in the direction of b is:
|a| cos(t) where t is the angle between a and b.

The dot product A.B satisfies the relationship:
a.b = |a| |b| cos(t)

The required component is therefore:
a.b / |b|
= (7.0, 7.9).(7.9, 9.5) / sqrt(7.9^2 + 9.5^2)
= (55.3 + 75.05) / 12.35
= 10.55

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