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Alex_Xolod [135]
3 years ago
12

CAN ONE ON U GUYS HELP ME?? I WILL GIVE YOU 50 PTS THE FIRST ONE WILL GET BRAINLIEST!!

Mathematics
1 answer:
Radda [10]3 years ago
4 0
<h2>Answer with explanation:</h2>

1. Let x = Number of nickels

y= Number of quarters

Equation: x+y= 20  (i)

Equation: 0.05x+0.25y=3   (ii)  [∵ 1 nickel = $0.05 , 1 quarter = $0.25]

Multiply equation (ii) by 20, we get

x+5y=60  (iii)

Eliminate (i) from (iii), we get

4y=40\Rightarrow\ y=10

put y= 10 in (i) ,

x+10=20\Rightarrow\ x=10

Sentence = " Jane has 10 nickels and 10 quarters".

2. Let x = Number of dimes

y= Number of nickels

Equation: x+y= 12  (i)

Equation: 10x+5y=75   (ii)  [∵ 1 nickel = 5 cents, 1 quarter = 25 cents]

Multiply equation (i) by 5, we get

5x+5y=60  (iii)

Eliminate (iii) from (ii), we get

5x=15\Rightarrow\x=3

put x=3 in (i) ,

3+y=12\Rightarrow\ y=9

Sentence = " Joey has 3 dimes and 9 nickels".

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Answer:

13. A

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A relation is a function if there is only one y assigned to each x.

That is if you have a set of points, there should be no repeated x value.

So looking at {(0,0),(-2,4),(-2,-4),(-3,7)} this is not a function because you have two x's that are the same. A.

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(0,-1)

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384 in³

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