How many questions should we answer in a test where there are 45 questions and a marking scheme of +4 & -1 to get a good score.? [above 100]

What is the binomial name of the horsefly species that's golden backside inspired a 24-year old researcher to name it after a pop star in january 2012?

Darwin studied two different types of tortoises on the galapagos islands. sort the characteristics based on which tortoise they describe.

Lois and clark own a company that sells wagons. the amount they pay each of their sales employees (in dollars) is given by the expression 12h+30w12h+30w12, h, plus, 30, w where hhh is the number of hours worked and the number of wagons sold. what is the amount paid to an employee who works 666 hours and sells 333 wagons?