Final answer:
To approximate 15 plus the cube root of 25 to the nearest tenth, find the cube root of 25, add it to 15, and round to the nearest tenth.
Step-by-step explanation:
To approximate 15 plus the cube root of 25 to the nearest tenth, we need to first find the cube root of 25, which is approximately 2.924. Then, we add this to 15 to get approximately 17.924. Finally, rounding this to the nearest tenth, we get the answer of 17.9.