Which is best estimate for the length of the short leg a if the hypotenuses c is about 10 cm 15

a)4 cm

b)5 cm

c)6 cm

d)8 cm

e)none of the above

(x-5)1/2+5=2 what is a possible solution?

What is r i 4.5+10r=-6.5 with work pls

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?