Answer:
Step-by-step explanation:50,897 is in standard form.
Expanded form is adding all your place values which is 50,000+800+90+7. There was a 0 in the thousand place so you do not add anything for that place value.
So (5×10,000) + (8×100) +(9×10)+(7×1) which is each number times it place value then add them all up.
Written form would be fifty thousand, eight hundred and ninety seven. So your answer is A, B, D