RIRI ...

Check out the picture I attached.

The amount of gold coating in millimeters needed for the ring is the difference between the total coating and the coating that has already been applied. From the given above, that would be,

0.03 mm - 0.021 mm = 0.009 mm

Thus, the answer to this question is letter B.

**Answer:** b) $60.56 per year of age

**Step-by-step explanation:** If the scatterplot of two variables shows a line and the correlation between them is strong, we can calculate a <u>regression</u> <u>line</u>.

<u>Regression</u> <u>line</u> is a line graph that best fits the data. Like any other line, its formula is given by

y = mx + b

with

m being the slope

b the y-intercept

The slope of the line, correlation and standard deviations of the two variables have the following relationship:

where

r is correlation

is standard deviation for the y data

is standard deviation for the x data

For our problem:

r = 0.34

2850

16

Calculating

m = 60.56

**Slope for the regression line of annual income per year of age is 60.56.**

**Answer:**

**$1,369.25**

**Step-by-step explanation:**

Mr. and Mrs. Wong purchased their new house for $350,000.

They made a down payment of 20%

Down payment = 20% of 350000

= $70,000

Loan amount, P = $350,000 - $70,000

= $280,000

Rate of interest, r = 4.2% or 0.042

Time, t = 30 years

Number of period, n = 12 ( monthly )

Formula:

Substitute the values into formula

**E = $1,369.25**

**Hence, The monthly payment for their mortgage will be $1,369.25**