Find the amount in an account if $65,950 is invested at 5.25% compounded daily, for 10 years and 9 months.

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

Is this a polynomial function? i need to know asap

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?