Can someone me with writing and solving one-step inequalities

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

In the following situation, determine whether you are asked to determine the number of permutations or combinations. then do the calculation how many ways are there to pick a starting five from a basketball team of twelve members? a. permutation; ps - 2520 b. combination; 1c, - 792 c. combination: 2cs - 2520 d. permutation; ps - 95040

Ten times the square of a non-zero number is eqaul to ninety times the number