2.) Find the vertex only for the following function:
y = -3x^2 + 12x - 5

( 1 ) Find by using a formula of (-b/2a, (4ac-b²)/4a)

The vertex is at (2,7)

( 2 ) Find by using a derivative (Calculus)

You can also find a vertex by using a calculus. Using a derivative

Then substitute y' = 0 to get a vertex.

Then substitute x = 2 in the equation of y = -3x²+12x-5

x = 2 and y = 7, therefore. The vertex is (2,7)

b.my answer is b.

brainliest

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls