Its adding the current number by the previous number so the next three would be 21,34,55
Answer:
2400 mm
Step-by-step explanation:
(80 x 60) - (60 x 40)
y = -4x
y = mx+b
b = 0
m = -4
here are some basic directions:
1. mark the point (0, 0) on the coordinate plane since b, aka the x intercept (where the line intersects with the x axis)
2. mark another point (1, -4) on the coordinate plane since we have defined a hawt slope ykyk
3. use the two points to guide ur ruler and draw a line idk how to describe it but yeah <3
Part A:

The first step of completing the square is writing the expression

as

which expands to

.
We have the first two terms exactly the same with the function we start with:

and

but we need to add/subtract from the last term, 49, to obtain 41.
So the second step is to subtract -8 from the expression

The function in completing the square form is

Part B:
The vertex is obtained by equating the expression in the bracket from part A to zero


It means the curve has a turning point at x = -7
This vertex is a minimum since the function will make a U-shape.
A quadratic function

can either make U-shape or ∩-shape depends on the value of the constant

that goes with

. When

is (+), the curve is U-shape. When

(-), the curve is ∩-shape
Part C:
The symmetry line of the curve will pass through the vertex, hence the symmetry line is

This function is shown in the diagram below