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marin [14]
3 years ago
8

Estimate 8978 x 38 by first rounding each number so that it has only 1 nonzero digit.​

Mathematics
1 answer:
Afina-wow [57]3 years ago
6 0

Answer:

9,000 x 40 = 360,000

Step-by-step explanation:

9,000 x 40 = 360,000

A one nonzero digit is a number that has only one number that's not 0. For example, 300 has only one nonzero digit.

Hope this helps!

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See below for answers and explanations

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<u>Problem 4:</u>

The line of regression is \hat y = a+bx where:

a=\overline y-b \overline x

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b=\frac{r*s_y}{s_x}

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This means our final regression line is \hat y = 30.2 + 0.16x

<u>Problem 5:</u>

The slope, b=0.16, means that for every 1 point earned for a student's pre-exam total, their final exam score will increase by 0.16 points for each point they earned on the pre-exam.

<u>Problem 6:</u>

The y-intercept (or constant), a=30.2, means that if a student's pre-exam total were 0, then they would expect to get a 30.2 on the final exam.

<u>Problem 7:</u>

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<u>Problem 8:</u>

The fraction of variability (aka. coefficient of determination), R^2, means that a certain proportion (or percentage) of the variance in the response variable can be explained by the explanatory variable. In context, this means that 36% of the variance in final exam scores can be explained by the pre-exam scores.

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