Suppose that a teacher agrees to pay a student 10¢for every problem in this chapter that the student solves correctly, and fines the student 5¢for every problem done incorrectly. if at the end of 30problems they do not owe each other any money, how many problems did the student solve correctly?

 10

Step-by-step explanation:

Let x be the number of correct problems and y be the number of incorrect problems.

Given:  A teacher pays a student 10¢ for every problem in this chapter that the student solves correctly, and fines the student 5 ¢ for every problem done incorrectly.

At the end of 30 problems they do not owe each other any money.

The by considering the given information we have the following equations :-

From (2), we have

Put in (1)

Then,  

Hence, the number of correct problems is 10 and the number of incorrect problems is 20.

which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud

1 aud = 0.9668 usd

step-by-step explanation:

sorry just need the points

76%

step-by-step explanation:

24% are dogs and the remaining is 76% because 100-24=76