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Lady bird [3.3K]
3 years ago
12

What is the better deal: Babysitting for 8 hours and making $72.00 or babysitting for 6 hours and making $57.00

Mathematics
1 answer:
Marianna [84]3 years ago
5 0
The better deal would be to babysit for 6 hours and making $57.00. 
1. First, I found the unit rate. How much do you make for 1 hour of work? 72/8=9. So, you make $9.00 per hour.
2. Second, I did the same thing with the other situation. 57/6= 9.50. So, you make $9.50 per hour. 
3. The better deal would be to babysit for 6 hours making $57.00 because you are making more money per hour. 9<9.5
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If x = 1 is a common root of ax² +ax + 2 = 0 and x² + x + b = 0 , then ab =
vodka [1.7K]

Answer:

ab = 2

Step-by-step explanation:

Given equations

ax² +ax + 2 = 0

x² + x + b = 0

root of both the equation

x= 1

then we can plug in x = 1 in both the equation

ax² +ax + 2 = 0                        x² + x + b = 0

a*1² +a*1 + 2 = 0                        1² + 1 + b = 0

a +a + 2 = 0                                 1 + 1 + b = 0

2a + 2 = 0                                    2 + b = 0

2a = -  2                                         b = -2

a = -2/2 = -1

Thus,

a = -1

b = -2

a*b = -1*-2 = 2

ab = 2

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3 years ago
Suppose you have a set of data points with a correlation of 0.85. What is the variance? A. Variance = √ r = 0.92195 B. Variance
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Answer:

B. Variance = r2 = 0.7225

Step-by-step explanation:

Given the correlation coefficient, variance is obtained by squaring the correlation coefficient to obtain what is also know as coefficient of determination. Gives information on the predictive power of the model

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Step-by-step explanation:

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