What is the probability of choosing an odd number if there are 10 odds out of 16 total?

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

One side of a rectangle is 7 feet shorter than seven times the other side. find the length of the shorter side if we also know that the perimeter of the rectangle is 306 feet.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1