4. 19
5. A. 105.7
By the way, if you're struggling with math problems I recommend you khan academy
Hope this helps :)
－81＝3(5－4r)
27＝－(5－4r)
27＝－5＋4r
－4r＝－5－27
－4r＝－32
r＝8
Hope my answer helped u :)
4.16=416/100
416/100=4•104/4•25
=104/25
4.16=104/25
