Prove the divisibility of the following numbers:
1. 25^7+5^13 by 30
2. 7^6+7^5−7^4 by 11
3. 5^5−5^4+5^3 by 7

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.

Question 13 (1 point) jerome is starting a new job. his contract states he will earn $42,000 the first year, and will get a 4% raise per year. which function s(x) represents jerome's salary after a certain number of years, x?