50 points for 4 questions? that's about 10.25 points per queston which is a little over double the ususal I'll take it
2. 18 and 5/12 + 8 and 10/17+23 and 7/12+28 and7/17= 18+5/12+8+10/17+23+7/12+28+7/17= 18+8+23+28+5/12+7/12+10/7+7/17= 77+12/12+17/17= 77+1+1= 79 last one
3. perimiter, just add them 20 and 9/16+23 and 3/8+21 and 5/6+24 and 5/8= 20+9/16+23+3/8+21+5/16+24+5/8= 20+23+21+24+9/16+3/8+5/16+5/8= 88+9/16+5/16+3/8+5/8= 88+14/16+1= 89 and 7/8 last one
4. 3 and 3/5+y+5 and 2/3=15 3+3/5+y+5+2/3=15 3+5+3/5+2/3+y=15 8+3/5+2/3+y=15 minus 8 both sides 3/5+2/3+y=7 3/5times 3/3=9/15 2/3 times 5/5=10/15 9/15+10/15+y=7 19/15+y=7 minus 19/15 from both sides y=7-19/15 y=7-15/15-4/15 y=7-1-4/15 y=6-4/15 y=5+15/15-4/15 y=5+11/15 y=5 and 11/15 2nd one
5. perimiter=total area around 13 and 3/8+8 and 1/2+x=38 13+3/8+8+1/2+x=38 13+8+3/8+1/2+x=38 21+3/8+1/2+x=38 minus 21 both sides 3/8+1/2+x=17 1/2 times 4/4=4/8 3/8+4/8+x=17 7/8+x=17 minus 7/8 both sides x=17-7/8 x=16+8/8-7/8 x=16+1/8 x=16 and 1/8 2nd one
