What is 4 3/4 + 6 4/5​

Which linear equations have an infinite number of solutions? check all that apply.  (x  –  3/7)  =  2/7(3/2x  –  9/14)8(x  +  2)  =  5x  –  1412.3x  –  18  =  3(–6  +  4.1x)(6x  +  10)  =  7(x  –  2)4.2x  –  3.5  =  2.1 (5x  +  8)

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.