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Without using a calculator, compute $1002^2-502^2+298^2-202^2$.? Who is the new Albert Einstein on earth after Stephen Hawking died? It's about moment generating problem. Help me to solve this problem please? What does it mean that grapefruit lost more grams than apples when reacting to HCL? How do I solve [f(x+3)-f(x)]/[x+3-x] when f(x) = 4-x^2?