Please help me with this ??

The system of equations graphed below has how many solutions?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.