Spider-Man worked 0.75 hour on math, 0.675 hour on writing, and 0.25 hour each on science and social studies. How many hours did he work in all?

Gh bisects fgi. find the measure of hgi •15° •21° •10° •8°

Can someone explain to me how to do

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?