Final answer:
Advise your friend to increase the oven temperature since 175°F is lower than the typical temperatures for most baking and roasting tasks.
Step-by-step explanation:
When considering the appropriate temperature for cooking in an oven, it's important to know what you're preparing. Common cooking temperatures for cakes are about 350°F, while for a chicken, you might roast it at 400°F. Given that your friend set the oven temperature at 175°F, and considering that this is lower than the typical temperatures required for most baking and roasting tasks, I would advise him to increase the oven temperature, unless he's keeping food warm or using a particularly slow-cooking recipe.