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
answers
2. 4th option
3. 4th option
4. 2nd oiption
5. 2nd option