![subject](/tpl/images/cats/mat.png)
Mathematics, 12.11.2020 17:10 miaaa0
John is twice as old as Mary. The sum of their ages is 21. How old is Mary?
Let J = John's age and M = Mary's age. Select the system equations that represents the problem.
J - 2M = 0
J = M + 2
M - 2J = 0
J + M = 21
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Other questions on the subject: Mathematics
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 16:30, kayleefaithblair
Scott harris can invest $7,000 in a 1-year cd that earns interest at an annual rate of 4 percent compounded monthly. the amount per $1.00 is 1.040742. he can also invest $7,000 in a 1-year cd at annual rate of 4 percent compounded quarterly. the amount per $1.00 is 1.040604. what is the difference in the amount of interest earned for each investment? a) $0.96 b) $0.81 c) $0.87 d) $0.88
Answers: 1
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 16:30, sierrabuckner645
Which of the following is the correct ratio for converting kilograms to grams
Answers: 3
![image](/tpl/images/cats/mat.png)
You know the right answer?
John is twice as old as Mary. The sum of their ages is 21. How old is Mary?
Let J = John's age and...
Questions in other subjects:
![Konu](/tpl/images/cats/User.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 14.05.2021 18:50
![Konu](/tpl/images/cats/mat.png)
Mathematics, 14.05.2021 18:50
![Konu](/tpl/images/cats/mat.png)
Mathematics, 14.05.2021 18:50
![Konu](/tpl/images/cats/biologiya.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 14.05.2021 18:50
![Konu](/tpl/images/cats/mat.png)
Mathematics, 14.05.2021 18:50
![Konu](/tpl/images/cats/biologiya.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 14.05.2021 18:50