A candle maker is ordering wax. Each small candle uses 12 ounces of wax. Each large candle uses 18 ounces of wax. The candle maker wants to make 42 small candles and 38 large candles. Which answer is the most reasonable estimate of the total amount of wax needed?

700 ounces because 10 × 40 + 10 × 30 = 700

800 ouces because 10 × 20 + 20 × 30 = 800

1,200 ounces because 10 × 40 + 20 × 40 = 1,200

1,800 ounces because 10 × 20 + 40 × 40 = 1,800

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?