Lorena and rebecca went to 10 horseback riding lessons. three of the lessons were outside the barn. what decimal represents the part of the horseback riding lessons that were spent outside?
can you explain this correctly? if not, it's okay..

Which product is positive a is 2/5 -8/9 -1/3 -2/7 b is -2/5 8/9 -1/3 -2/7 c is 2/5 8/9 1/3 -2/7 d is -2/5 -8/9 1/3 2/7

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

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?