Solve the following equation algebraically -16=16x

Which is the standard form for this number? (4 x 1 100 ) + (8 x 1 1,000 ) + ( 3 x 1 100,000 ) ? a) 0.004803 b) 0.04803 c) 0.0483 d) 0.483

Use sigma notation to represent the following series for 9 terms.

Could someone me with this question i’ve been stuck on it for 20 minutes