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77julia77 [94]
3 years ago
10

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.
Mathematics
2 answers:
anzhelika [568]3 years ago
6 0

Answer:

6\ polyphonic\ ringtones  and 1\ standard\ ringtone

Step-by-step explanation:

Let

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

y ----> the number of standard ringtones

we know that

x+y=7

x=7-y -----> equation A

3.25x+1.50y=21 -----> equation B

Solve the system of equations by substitution

Substitute equation A in equation B and solve for y

3.25(7-y)+1.50y=21

22.75-3.25y+1.50y=21

3.25y-1.50y=22.75-21

1.75y=1.75

y=1\ standard\ ringtones

Find the value of x

x=7-1=6\ polyphonic\ ringtones

Vlad1618 [11]3 years ago
4 0

Answer:

6 polyphonic, 1 standard

Step-by-step explanation:

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The measure of L in triangle LMN is 33°. The measure of M is 79°. What is the measure of N?
FromTheMoon [43]

Answer:

<h2>N = 68°</h2>

Step-by-step explanation:

Since ∆LMM is a triangle all it's interior angles sum up to 180°

To find M add up all the angles and N and equate it to 180° to find N

That's

L + M + N = 180

33 + N + 79 = 180

N + 112 = 180

N = 180 - 112

We have the final answer as

<h3>N = 68°</h3>

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2 years ago
How do I solve part b?
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Answer:

x \approx 1.4

Step-by-step explanation:

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Round:

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