Can u piz do all of number 1 aka a, b,and c

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.

The ratio of the measures of the three angles in a triangle is 2: 9: 4. find the measures of the angels

Yahir designs bracelets. he uses between 9 and 15 red and yellow beads in the ratio of 2 red bead to 5 yellow beads. drag the beads into the container to meet these requirements