How many solutions does this equation have? –2f + 2f = 0

In the 30-60-90 triangle below side s has a length of and side r has a length

Divide the following fractions 3/4 ÷ 2/3 1/2 8/9 9/8 2

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