Explain how you could use the distributive property and mental math to find 5 x 198

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.

Which expression is a factor of 12x2 + 29x – 8? x – 8 2x – 1 3x + 8 4x + 1