book Maths Puzzle Numerical Ability

suppose that f(x)=ax+b if (f(x))=8x+21 then what is a+b

Read Solution (Total 0)

book Other Question

clear fractions and decimals, solve and check
1/2+4m=3m-5/2

i am really stuck on how to solve it properly the denominater 2 is under the 1 and the denominater 2 is under the 5 {{{1.4x^2+4.9x+2.6=0}}}