How do you solve: 1.10x-10+30=12x-42.15x+5+22x+4=1203 .40+9x-2=20x+5

Solve 2x+y=3 x+y=5 in substitution method

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

Need 50 will mark brainliest answer. find the lengths of all the sides and the measures of the angles.