What is the discriminant of 9x2 + 2 = 10x?

What scale factor was applied to the first rectangle to get the resulting image interior answer as a decimal in the box

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

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