(-6.7x 2 + 2.3x y + 5.2) - (-14.9x 2 - 3.5x y + 7.1)

You put the following items into your rucksack. ham 600 g cheese 380 g tomatoes 270 g how much do all the ingredients weigh in total?

True or false look at the picture pls : /

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?