See https://web2.0calc.com/questions/can-someone-help-please_7.
D. The y-intercept of the function is (0, 5) and e. The function crosses the x-axis twice are true
The equation is a^2 + b^2 = c^2 and the long slanted side is always c so
12 + b^2 = 15
So using the equation a^2 + b^2 = c^2 and the transverse property the answer is 1.732
670=10(a)+20(b)
47=a+b
a is amount of $10 coins=27
b is amount of $20 coins=20