Rebecca has r number of crayons. julie has 17 more crayons than rebecca. which expressions correctly show the number of crayons that julie has? 17 - r r - 17 r + 17 17 + r none of the above

Given f(x) = 10x + 4 and g(x) = 3x - 8, what is f(x) + g(x) ? - 7x - 4 - 13x + 4 - 7x + 4 - 13x - 4

How to do this , and can some one explain

John used linear combination to solve the system of equations shown. he did so by multiplying the first equation by -3 and the second equation by another number to eliminate the x-terms. what number did jonas multiply the second equation by? 4x-6y=23x+5y=11