Write the sum using summation notation, assuming the suggested pattern continues. -8-3+7+67

Me i’m stuck on all these questions besides the two bottom ones

Fifty students are trying to raise at least 12,500 for a class trip. they have already raised 1,250. how much should each student raise on average in order to meet the goal? write and solve the two step inequality for this problem

Use order of operations to solve. (24 divided 3) + 3.5 + 3 power of 3