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adell [148]
3 years ago
8

A bag contains 55 coins of $1 and ¢50 denominations. Find the number of coins of each denomination, if the total amount in the b

ag is $40.
Mathematics
1 answer:
DerKrebs [107]3 years ago
3 0

Answer:

Number of $1 coins are 25 and number of 50 cent coins are 30.

Step-by-step explanation:

Let's set up the equations.

Let there are x number of $1 coins

There are y number of 50 cent coins

So, x+y =55

1 x+0.50 y =40

Solve the equations for x and y.

Solve the first equation for y.

y=55-x

Substitute y as 55-x into the second equation.

1 x+0.50(55-x)=40

Solve the equation for 'x'.

Distribute the 0.50 to get rid the ( ).

1 x+27.5-0.50 x= 40

Combine like terms

0.50 x +27.5=40

Subtract both sides 27.5

0.50 x =12.5

Divide both sides by 0.50

x=25

Now, plug in x as 25

y=55-25

y=30

So, number of $1 coins are 25 and number of 50 cent coins are 30.

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The repair person did 5 hours of work.

Step-by-step explanation:

155 = 25x + 30

125 = 25x

5 = x

6 0
3 years ago
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Marta_Voda [28]
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8 0
3 years ago
Calculate the slope of the line between (3,7) and (2,7).
goldenfox [79]

Answer:

It’s y2-y1 over x2-x1

Y2 is 5 and y1 is 5

5-5

X2 is 7 and x1 is -2

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7- negative 2 is 9

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Step-by-step explanation:

Hope this helps:)

7 0
2 years ago
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If h(x) = x – 7 and g(x) = x2, which expression is equivalent to(g*h)(5)? a (5 – 7)2, b (5)2 – 7, c (5)2(5 – 7), d (5 – 7)x2
asambeis [7]
H(x) = x - 7
g(x) = x^2
(g * h)(x) = x^2 (x - 7)
(g * h)(5) = 5^2 (5 - 7)
8 0
3 years ago
HELP PLEASE, I REALLY DONT UNDERSTAND THIS!
zubka84 [21]

Answer: Since 3−5+2=0, then 2

is the additive inverse of 3−5 is 2

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Step-by-step explanation: additive inverse

The additive inverse of any number

x

is the number that gives zero when added to

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. Example: the additive inverse of

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