The answer is d.61. 66+7=73. 13+8=21. 52+9=61. 10+10=20
-10-f=-6f+10
-f+6f=10+10
5f=20
F=4
11.p=-8, 17-8=9
12.y=11, 3*11=33+16=46
13.t=4, 4*4=16-14=2
14.x=9, -9x 9*8=82-9=72-9=62
15.z=4, 12*4=48-18=30
16.g=0, 4*0=0, 7+0=7
17.x=4, 9*4=36-24=-3
18.q=3, 18*3=48+2=50
19.c=2, 3*2=6-4.5=4.1
20.y=4, 9+4=13+4.8=17.4
I cannot see the picture to good
I think 6,1 and the upper point is -6,11
