Please help i’ll mark brainliest

Step-by-step explanation:

Let's take statement C and D.

For C;

Vertex means a single point of intersection of a curve formed from a quadratic equation when we assume the curve to be of equal half.

We can know this point by drawing a graph and locating the points X and Y where the curve gives a maximum curve or minimum curve because at that point the curve is divided in half.

And a straight line drawn through that point to divide the curve in two is the axis of symmetry. See attachment for more clarification.

For D,

When you plot the graph of the quadratic equations ;

To do that theoretically.

You find the dy/dx of the expression and equate it to zero;

Let's take an example

y = 4x^2 + 3x -6

dy/dx= 8x + 3; if we equate it to 0

We have 8x + 3 = 0

8x = -3

x = -3/8

Then if we substitute this value of X in

y= 4x^2 + 3x -6; we would get the value of y;

Now if y = negative we know we have a minimum graph but if Y is positive we have a maximum graph.

However without checking the value of y to determine if the graph is a positive or negative graph;

We can take the second derivative of y

This is. dy/ dx[8x + 3]

8

Since d^2y/ dx^2 =8; which is > 0; we know the equation has a maximum point

But if d^2y/ dx^2; we evaluate to less than zero. We know the quadratic equation gives a minimum point.

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step-by-step explanation:

answer:

total cost for tiles and paints is $924.  

step-by-step explanation:

we have been given that a community hall is in the shape of a cuboid. the hall is 40m long 15m high and 3m wide.

the paint will be required for 4 walls and ceiling.

let us find area of walls and ceiling.

therefore, the area of walls and ceiling is 1410 square meters.

given: cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. therefore,

therefore, the total painting cost is $564.

tiles will be required for floor. let us find the area of floor.

given: 1m squared floor tiles costs $3. so,

therefore, the total tiles cost is $360.

now let us find combined total cost of tiles and paint.

therefore, the combined total cost of tiles and paint is $924.