Can 15 over 20 be simlefied?

What is a you use to help with mathematics? What two numbers equal 13 but when multiplied equal -90? How many pennies in ten thousand? Write a C program to read the internal test marks of 25 students in a class and show the number of students who have scored more than 50 percent in the test. Make necessary assumptions? What is the supplementary requirements? What is the sine of 7 degrees? What is the answer to 25 plus -5? How much is one half plus one half plus 1 fourth? What is plunge conversion? What is the value of a 1968 uncirculated Denver mint set? Who was Euclid and what were his contributions to the mathematical world? What is the greatest common factor of the numbers2x2x3 and 2x2? Is 2088 divisible by 3? How many pieces of info are on whmis labels? How do you subtract and reduce unlike fractions? Is there any shapes that have at least one reflex angle? How do you calculate yardage for sweatpants? What are the two factors depend on the shape of cell? What is the sum of an integer and its opposite integer will always be zero? How do you work out 4 by divided 336?