Answer:
when w is 3 and x is 2.5, the value of the expression 2w^4 - x is 159.5.
Explanation:
To evaluate the expression 2w^4 - x when w is 3 and x is 2.5, we simply need to substitute these values into the expression and simplify:
2w^4 - x
= 2(3)^4 - 2.5 (substitute w=3 and x=2.5)
= 2(81) - 2.5 (evaluate 3^4 = 81)
= 162 - 2.5 (multiply 2 by 81)
= 159.5
Therefore, when w is 3 and x is 2.5, the value of the expression 2w^4 - x is 159.5.