How many solutions does the system 2y=10x-14 and 5x-y=7 have? need worked out step by step !

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

If f(x) = 4x – 3 and g(x) = 8x + 2, find each function value a. f[g(3)] b. g[f(5)] c. g{f[g(-4)]}