Nalini thinks of an number. She doubles it and adds 5. Her answer is sixteen more than the number she thought. What number did Nalini think of? a) 10 b) 11 c)12 d) 6

The function show two sisters' savings account and the rate at which they plan to deposit money

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”?

Can someone me with this? i’m not sure what to put for my equations.