there's nothing to "solve"
Just evaluate the expression using the values given. Wherever you see an r, replace it with a 1. Same for s, using 5.
However, first you have to know what it means:
2(s^3) - 4(r^1)
Now just plug and chug:
2(5^3) - 4(1^1)
2(125) - 4(1)
250 - 4
246
2s^3 – 4r^1 r = 1 and s = 5
explian how to solve it
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