John bought 7 pens for $12.88. what is the cost of one pen?

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10

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

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct