9. The sum of four consecutive numbers in an A. P. is 28. The product of the
second and third numbers exceeds that of the first and last by 18. Find the
numbers.
The fourth term of an A. P. is 1 and the sum of the first 8 terms is 24 Find the

d

step-by-step explanation:

you first to choose the points and then move from then as the slope you have

18 units²

step-by-step explanation:

first let's find altitude bd using the distance formula

d = √((y₂ - y₁)² + (x₂ - x₁)²)

bd = √((0 - -3)² + (0 - 3)²)

bd = √18

given the placement of points a and c, we can denote that point d bisects segment ac.

we will call ac the base.

using the distance formula

ac = √((0 - 6)² + (-6 - 0)²)

ac = √72

knowing our base and our height, we can plug these into our triangle area formula

area = (b * h)/2

area = (√18 * √72) / 2

area = (√1296) / 2

area = 36 / 2

area = 18 units²