Roberta has $10,540 to invest. she plans to invest her money in certificates of deposit (cds) that have 2.1% interest, a stock portfolio that makes 2.5% interest, and a savings account that has 1.5% interest. she would like to make $231.69 in annual interest from her investments. also, to provide some risk security, she wants to invest a third of the amount she puts in the stock portfolio in the savings account. let x be the amount invested in cds, y be the amount invested in the stock portfolio, and z be the amount invested in the savings account. what is the amount roberta invests in each type of investment?

the amount invested in cds (x) is $

the amount invested in the stock portfolio (y) is $

the amount invested in the savings account (z) is $

First, think of what you know. you know that the number t the end of the equation will need to be subtracted because it is the money he lost from buying the lawn mower. and your first two weeks have negative profit, so that tells you that c and d are wrong. now you can plug any of the weeks into a and b to see which one works. i'll start with plugging week 1 into a.this isn't right because it says your answer for week one should be -90.so now we need to try the same thing with b.this one got you the right answer, (sometimes if you only check with one of the weeks multiple will work so you need to check with more of the weeks, but it worked out fine here)this means that b is the correct answer.let me know if you need more clarification. i hope this : )