Grace gives her sister a riddle: i have number x. i add 15 to twice x to get result a. i subtract 4 from x to get result b. i multiply result b by 3 to get result c. result a is equal to result c. grace's sister said the riddle cannot be solved, but grace thought otherwise. who is right? explain

Solve 13 + w/7= -18 (w/7 is a fraction)

My final challenge question of the day! i have no tests, nothing to do this for, it is simply giving away free points for a you tube video! so 50 free points for answering the most simple question ever! here is the key to getting brainiest for this question. answer in under 50 seconds. you think you can do it. i think you can. here is the question: 1x2= i know! easiest question ever! and yes! if you answer this question, you will be on you so come on and get the free 50 while you can!

The function below is written in vertex form or intercept form. rewrite them in standard form and show your work. y = 5(x+3)^2-4