Jonathan has a comic book collection. He tells you he sold half of them, but then bought 12 more new comics.
After this, Jonathan now has 90 comic books. How many comic books did he have before he sold some?
a) Let b = the number of Jonathan had before selling some. Write the equation you would use to solve this
problem.
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b) Now solve your equation
Jonathan had
comic books before selling.

Ihave a 69 and an 82. the 69 is worth 40% of my grade and the 82 is worth 15%. can someone tell me my current average grade.

Whose conclusion is correct? choose all that apply. (two max) elijah emily edward esme

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.