Make up an equation that has an infinite number of solutions

Ageologist had two rocks on a scale that weighed 4.6 kilograms together. rock a was 0.5 of the total weight. how much did rock a weigh?

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

Iknow its nothing to do with education, but what type of thing should i wrote here? ? : ) its for mcdonald's btw.