HELP HELP HELPPP PLEASEE which expression has a leading coefficient that is a perfect square?

49w2+w+53

10w2−19w+100

2w2+25w−9

50w2−5w+25

(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”?