Anyone help pls no links!! Only help me on #8 plss

Answer:
90
Step-by-step explanation:
First you do s^2. In this case s is 3 and 3x3=9. Then multiple 9 by r. 9x2=18. Finally, multiply 18 by t. 18x5=90. The solution is 90
Step-by-step explanation:
4.5(9+d)-6
6.3h-j
8.r(s)²(t)
hope it helps.