Answer: There are many uses for the variable* y in math: it is often used as a variable and the y axis of a coordinate plane (the line that is vertical.)
* = Variable: any unknown number in algebra, is usually replaced with letters, such as x or y.
Answer:
40
Step-by-step explanation:
Answer:
2 times 3 = x
Step-by-step explanation:
thats how i would do it
Solution: Mark's initial amount 
Mark invest's his inheritance amount in savings account with an annual interest of 3.1%. Therefore, the Mark's interest amount after 1 year is:



Therefore, total amount Mark will have after 1 year
=$30930
Now Charles also has $30000 from his inheritance.
Charles invests his inheritance in a CD paying 5.8% annual.
Therefore, interest amount for Charles after 1 year is:



Therefore, total amount Charles will have after 1 year
=$31740
Therefore, Charles will have $31740 - $30930 = $810 more than Mark