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Fiesta28 [93]
3 years ago
12

Help me with pre algebra worth 50 points

Mathematics
1 answer:
Lisa [10]3 years ago
4 0

The total number of rocks collected:

r + 2r + 2r - 5

Rocks collected by Maria and Javier:

3r

The difference between the number of rocks collected by Pablo and Maria:

r - 5

The sum of rocks collected by the boys:

4r - 5

The number of rocks collected by Pablo and Maria:

r + 2r - 5

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During a baseball game, a food stand sells popcorn for $2.50 and hotdogs for $3 each. If at the end of the game, the stand made
nasty-shy [4]
Let
x-------> bags of <span>popcorn
</span>y-------> bags of hotdogs

we know that
2.50x+3y=200-------> equation 1
x=2y--------> equation 2

substitute 2 in 1

2.50*[2y]+3y=200--------> 5y+3y=200------> 8y=200-----> y=200/8
y=25
x=2y-----> x=2*25-----> x=50

the answer is
50 bags of popcorn
25 bags of hotdogs<span />
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4 years ago
What happens to the diagonal of a rectangle when the rectangle is reflected across a line of symmetry? What does this suggest ab
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When you reflect a diagonal over a line of symmetry, the diagonal will land perfectly on the other diagonal (and vice versa). This suggests that one diagonal is a mirror copy of the other.

Another way to put it: The vertex points of the rectangle will swap when we reflect over a line of symmetry. A diagonal is simply the opposite vertex points joined together. So this is why the diagonals swap places (because the vertices line up perfectly when you apply the reflection).

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