Whenever I get a question asking about an object being thrown into the air or falling, the equation for the parabola always has a value of -16t^2 as the first term. Is -16 the universal 'a' constant in a quadratic equation dealing with gravity? Or is this just me?

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

❤️ (geometry) does the construction demonstrate how to copy an angle correctly using technology a) yes; the distance between points a and f was used to create circle h b) yes; the distance between points f and g was used to create circle h c)no; the distance between points a and f was used to create circle h d) no; the distance between points f and g was used to create circle h