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Mathematics

2 answers:

solniwko [45]3 years ago

7 0

Answer:

Seconds in second row: 48
Glasses in third row: 11

Step-by-step explanation:

Answer for seconds in second row:

Set up a proportion: $\frac{5}{20} = \frac{12}{x}$
Cross multiply, then divide: 20 × 12 = 240, 240 ÷ 5 = 48

Answer for glasses in third row:

Set up a proportion: $\frac{5}{20} = \frac{x}{44}$
Cross multiply, then divide: 44 × 5 = 220, 220 ÷ 20 = 11

I hope this helps!

djyliett [7]3 years ago

5 0

Step-by-step explanation:

1 )48

2 )11

answer is this

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Analyze Corey’s work to find his error. What is Corey’s mistake? He substituted 80 for x instead of y. He should have added 88.2

Anni [7]

x is the temperature and y is the number of swimmers. If there are 80 swimmers, then y = 80 instead of x = 80

This is how Corey should have solved

y = 1.505*x - 88.21

80 = 1.505*x - 88.21 <--- replace y with 80

1.505*x - 88.21 = 80

1.505*x = 80 + 88.21 <--- add 88.21 to both sides

1.505*x = 168.21

x = 168.21/1.505 <--- divide both sides by 1.505

x = 111.767

x = 111.8

If there are 80 swimmers at the pool, then the possible outside temperature is roughly 111.8 degrees F. This temperature seems awfully large, so it's possible that Corey's regression equation has limited scope; in other words, it isn't too useful if x is outside a given interval

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