Alina has just received 3 video games for her birthday to add to her existing 12 video games. a week later she went to the thrift store and doubled her video games. another week later she bought 5 more games. write a numerical expression with parentheses for the total number of video games alina has now.

What is the factored form of the following expressions? d^2 – 13d + 36

Ahiker stands at an unknown elevation before he ascends 2 miles up a mountain to an elevation of 9 miles. find the elevation of the hiker before his ascent.

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”?