What is 11 < x + 7? the "x" is a variable! plz show work!

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

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?