A pen cost Np and a pencil cost N15 less than a pen. what is the cost of two pen and four pencil

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Which choice represents the sample space ,s for this event

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2