Question

PLEASE HELP! PLEASE HELP! PLEASE HELP!
The question is in the picture.

Answer 1

The answer is D.

Explanation:

plug in the values for the first formula.

`s=(7.2+6.7+4.5)/(2)`

`s=(18.4)/(2)`

s would then equal 9.2.

Then plug in you value for s and the values for a, b, and c into the second equation

`\sqrt{9.2(9.2-7.2)(9.2-6.7)(9.2-4.5)`

`\sqrt{9.2(2)(2.5)(4.7)`

`\sqrt{216.2`

this equals 14.7037 you just have to round up to get 14.704 which is d.

Answer 2

D

Explanation:

Firstly calculate the semi perimeter s

s =
`(7.2+6.7+4.5)/(2)` =
`(18.4)/(2)` = 9.2

Substituting values into Heron's formula

A =
`√(9.2(9.2-7.2)(9.2-6.7)(9.2-4.5))`

=
`√(9.2(2)(2.5)(4.7))`

=
`√(216.2)`

≈ 14.704 → D