Your answer will be B. Do u know to get it.
(4x-7y)(4x+7y)
4x times 4x= 16x^2
-7y times 7y= -49y^2
The law of cosines states that:
c^2=a^2+b^2-2abcosC
You already have all the values for the variables with the exception of x so:
x^2=25+100-100cos60
x=√(125-100cos60)
x=√75
x≈8.66 to nearest one-hundredth...
No of outcomes =16
favourable outcome=4
<span>probability of getting exactly 3 heads=0.25</span>
