2x-3 = your uncle's age. x stands for your age.
Systems of equations having an infinite number of solutions are lines that do not meet or intersect. These line are parallel which they have the same slope but different y-intercepts. By graphing the equations and using the choices, we will see that all except 10 can be the answer.
The formula for the law of cosines is:
a^2 = b^2 + c^2 - 2*b*c*cos(angle)
In this triangle b = 7, c = 8 and angle = 32.
a^2 = 7^2 + 8^2 - 2*7*8*cos(32)
a^2 = 18.018
a = SQRT(18.018)
a = 4.24
C = 4.2 feet.
