Please help me! I am giving 20 points

Last option is the correct answer.

Step-by-step explanation:

Matrix multiplication is only valid if the number of columns of the first matrix are equal to the number of rows of the second matrix;

Here, in the last option, first matrix has one column and second matrix has one row so this matrix multiplication is possible.

2 over 5

step-by-step explanation:

the 2: 3 ratio is the length of the ac segment to the cb segment total length. this implies that the ratio between segment ac length and segment ab length is 2: 5. point c is 2/5 from a to b, so the required fraction is 2/5.