Find the product of 21 and (6.3•10 with an exponent of -4)

Asequence of numbers begins with 12 and progresses geometrically. each number is the previous number divided by 2. which value can be used as the common ratio in an explicit formula that represents the sequence? 1/2 2 6 12

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

Me with this one question, and i'll upvote the brainliest answer