A square pyramid is rotated about a line perpendicular to the base and through the vertex. What angle of rotation maps the pyramid onto itself?

30º

45º

60º

90º

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

43lbs of tomatos cost $387. how much would 41lbs cost

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41