I already have the other answers just need an explanation i will give brainliest to whoever gets it right so if it's not right u don't get it

What is the area of the trapezoid shown ?

What is the measure of sty in oo below? 130 310 230 50

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?