Cho tứ diện abcd có sa=sa=sc, tam giác abc cân tại a có a=120, bc =a .tính thể tích

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)

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

The width of a rectangle is half as long as the length. the rectangle has an area of 18 square feet. what are the length and width of the rectangle?