The missing angle is 25. A triangle is always equal to 180° so you would subtract your know angles from 180 to find the missing angle 75+80+x=180 would be the equation
The values of 4s that are present in 4400 are 4 thousands and 4 hundreds. 4400 = 4 thousands + 4 hundreds + 0 tens + 0 ones so the value of first 4 is 4 thousands and second 4 is 4 hundreds.
