Which one is correct

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed

What is the perimeter of an isosceles triangle with each leg measuring 2x+3 and the base measuring 6x-2?