Can someone help me pls

How many grams are in 8 kilograms? if 100 grams = 1 kilogram

Find the sum of 4x^{2} -4+6 and -7^{2} +3x+1

Determine the number of outcomes in the event. decide whether the event is a simple event or not. upper a computer is used to select randomly a number between 1 and 9 comma inclusive. event upper b is selecting a number greater than 4. event upper b has nothing outcome(s). is the event a simple event? (yes or no) because event upper b has (fewer than, exactly, more than) one outcome.