<span>get their dot product, if the dot product is 0, then they're orthogonal (
perpendicular).
also keep in mind that, if two vectors bear the same slope, namely <a,b> and <c,d> and the simplified slope b/a is the same value as d/c, then they're
parallel vectors.</span>
A=x(1+r/n)^nt
21150=x(1+0.032/12)^84
21150=x(1+0.0026666)^84
21150=x(1.002666666)^84
21150=x(1.25069809)
21150/1.25069809=x
16910.56=x
Hope this helps!
4x + 8.....the factor is 4
4(x + 2)
120 = 15% x
15% = 0.15
x = 120 / 0.15 = 800
170 milliliters is the answer
