The difference of two numbers is 20. If 4 is subtracted from each number, the remainders are in the ratio of 2 :1. find the numbers.​

Find the quotient. 50a2 – 98b2 -5a +7b

The pyraminx is a rubik's cube-type toy in the shape of a tetrahedron. the pyraminx shown below has edges 15\,\text{cm}15cm long and vertical height h=12.2\,\text{cm}h=12.2cm. the triangle drawn with dashed lines is a right triangle. what is the distance rr? round your answer to the nearest tenth.

How many four digit even numbers can be formed from digits 1,2,3,4,5 if repetition is allowed. how can solve this using permutation formula