Hi! i think for this you set up two equations.
x=y
4+x+y=50
you can solve by substitution!! hope it helpes
A = 71.5 degrees (1 dp)
cos(A) = (21^2 + 16^2 - 22^2) / (2 x 21 x 16)
= 0.31696...
A = cos^-1(0.31696...) = 71.5 degrees
Answer:
c is the correct option as √ is 1/2×5=5/2.
This is my personal opinion.
3 x 0.79= $2.37
2 x 1.29= $2.58
4 x 0.15= $0.60
9 x 0.38= $3.42
$2.37 + $2.58 + $0.60 + $3.42= $8.97
$20.00 - $8.97= $11.03
The answer is $11.03