Someone help, what’s 1+1?

Find the value of x that will make l ll m

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

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