Question

The triangle below has a total perimeter of 450 cm. :

(triangle with sides 128 and 150. Third side unknown)

Write an equation and solve it to find the length of the longest side of the triangle.

128x + 150 = 450; x = 2.34 cm
x + 278 = 450; x = 172 cm
2x + 278 = 450; x = 86 cm
150x + 128 = 450; x = 2.15 cm

Answer 1

128 + 150 + x = 450.

Answer 2

278+x=450
x=450-278
x=?

Answer 3

solve it @Elise_a18

Answer 4

Then compare this answer with the given answer in the question