In a quadratic function of the form ax^2+bx+c, which of the following is not true?

a) the y-intercept is c.
b) if a is positive, the parabola opens up.
c) the vertex has an x-coordinate of -b/2a.
d) the axis of symmetry is the line y=-b/2a.

do i do it on a graph?

step-by-step explanation:

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47