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AnnZ [28]
3 years ago
15

A student has some $5 bills and $10 bills in her wallet for a total of $100. The amount of $10 bills she has is 3 more than 3 ti

mes the amount of $5 bills. How many of each type of bills does she have?
Mathematics
1 answer:
Sergeu [11.5K]3 years ago
7 0

Answer:

she has 6 $5 bills and 4 $10 bills I think I'm not sure

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Solve the system using substitution and describe your steps. <br> x=y-3 <br> 2x+y=12
Veseljchak [2.6K]
First you plug in for x,

2(y-3)+y=12

Then you solve for y
2y-5+y=12
-10y+y=12
-9y=12
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5 0
3 years ago
1 2 3 4 5 6 7 8 9 10
Elina [12.6K]

Answer:

(2x – 3)(5x^2 – 2x + 7)

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4 0
3 years ago
Find constants a and b such that the function y = a sin(x) + b cos(x) satisfies the differential equation y'' + y' − 7y = sin(x)
Elza [17]
The first thing we must do in this case is find the derivatives:
 y = a sin (x) + b cos (x)
 y '= a cos (x) - b sin (x)
 y '' = -a sin (x) - b cos (x)
 Substituting the values:
 (-a sin (x) - b cos (x)) + (a cos (x) - b sin (x)) - 7 (a sin (x) + b cos (x)) = sin (x)
 We rewrite:
 (-a sin (x) - b cos (x)) + (a cos (x) - b sin (x)) - 7 (a sin (x) + b cos (x)) = sin (x)
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 sin (x) * (- b-8a) + cos (x) * (a-8b) = sin (x)
 From here we get the system:
 -b-8a = 1
 a-8b = 0
 Whose solution is:
 a = -8 / 65
 b = -1 / 65
 Answer:
 
constants a and b are:
 
a = -8 / 65
 
b = -1 / 65
4 0
3 years ago
Simplify the following expression using the distributive property
Karolina [17]

Answer:

7z + 84

Step-by-step explanation:

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7 0
2 years ago
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Semenov [28]
I need to see the parallelogram or give a description of the parallelogram.<span />
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3 years ago
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