Jack is learning to save, spend, and give money away. He is determined to give
away 10% of his summer job earnings. If he gives away $256, how much did he earn
this summer?

$2,560

Step-by-step explanation:

-Given, that 10% is given away and that the total given away this summer was$256.

#We use the law of proportions to calculate the full value of 100%

let x be the total earnings made:

#Alternatively, we can just multiply 256 by 10.

Hence, the total earnings in the summer was $2,560

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is: