Can a triangle be made from the lengths 5m, 7m, and 9m? If so what kind of triangle; acute, obtuse, or right?

Obtuse.

Step-by-step explanation:

Yes a triangle can be made as  7 + 5 > 9.

Test for an acute triangle:

For acute triangle c^2 < a^2 + b^2  where c is the longest side.

For  right  triangle c^2 = a^2 + b^2  where c is the longest side.

For  obtuse triangle c^2 > a^2 + b^2  where c is the longest side.

Here:

9 ^2 = 81 = c^2

5^2 + 7^2 = 25 + 49 = 74 = a^2 + b^2.

- so the triangle is not acute.

Here c^2 > a^2 + b^2 therefore the triangle is Obtuse.

step-by-step explanation:

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.