if a woman sells bitcoins for £42000 which is 12%more than she originally bought them for then calculate the original value of her bitcoin

The sum of the product of 4 and x and the product of 7 and y is 61. the sum of the product of 12 and x and the product of 21 and y is 61. what are the values of x and y?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?

In a 45-45-90 right triangle, what is the ratio of the length of one leg to the length of the other leg? а . 1: 2 в. 2: 1 с. 2: 1 d. 1: 1