Isaac downloaded 7 ringtones. each polyphonic ringtone costs $3.25, and each standard ringtone costs $1.50. if he spends a total of $21 on ringtones, find the number of polyphonic and standard ringtones he downloaded.

 and

Step-by-step explanation:

Let

x -----> the number of polyphonic ringtones

y ----> the number of standard ringtones

we know that

-----> equation A

-----> equation B

Solve the system of equations by substitution

Substitute equation A in equation B and solve for y

Find the value of x

what is a pre-existing condition claus?

means if you're already damaged some way when you take out a medical insurance you will not get full compensation for that injury that you already have.

the answer for this question is 38