Soldering guns often use a soft solder alloy composed of 35.5% lead. If you are soldering parts onto a wagon and are only allowed to have a maximum of 2.51 g of lead in the finished product, how much solder can you use to attach all of the parts?

7.07g of solder

Explanation: This can be represented by the equation 2.51 = 0.355x with x being the grams of solder. To solve this we divide by 0.355. 2.51/0.355 = 7.07 (three sig figs).

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.