Four times the sum of a number and three is seven times the number decreased by three what is the number

Is the orthocenter of a triangle on the inside ?

Bruce is getting materials for a chemistry experiment his teacher gives him a container that has 0.25 liter of liquid in it.bruce need to use 0.4 of this liquid for the experiment. how much liquid will bruce use?

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer