(8.64 times 10 Superscript 20 Baseline) minus (7.83 times 10 Superscript 20 Baseline) 8.1 times 10 Superscript 19
0.81 times 10 Superscript 20
8.1 times 10 Superscript 21
0.81 times 10 Superscript 40
can somebody help

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.

Asap (i need to finish this quick) graph complete the sequence of transformations that produces △x'y'z' from △xyz. a clockwise rotation ° about the origin followed by a translation units to the right and 6 units down produces δx'y'z' from δxyz.