PLEASE HELPPP Micah buys 10 pens for every 2 pencils.
Rachel buys 12 pens for every 3 pencils.
Are their ratios of pens to pencils bought
equivalent?

Find the exact value of each of the following. in each case, show your work and explain the steps you take to find the value. (a) sin 17π/6 (b) tan 13π/4 (c) sec 11π/3

Which one ? is the answer and how to find this answer

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”?