Jasmine creates a code formed by choosing two digits at random from 0 to 9. The digits can repeat. How many possible two digit codes can be formed ?​

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

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.