Last week lori’s gift sold 60 get well cards it sold twice as many congratulations cards and three times as many birthday cards about how many cards did lori’s gift shop sell in all

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

Choose the more precise measurement. 26.4 cm or 8.39 cm

3x + 4y = 5 x- 3y = -7 solve by substitution