Which numbers round to 340 when rounding to the nearest ten?

The cost c, in dollars, for bananas depends on the weight w,in pounds, of the bananas. this situation is represented by the function rule c=0.5w (graph each function rule.tell whether the graph is continuous or discrete)

If 20% of a number is 35, what is 50% of that number?

What is the circumference of a circle with an area of 50.24 cm²?