I need step by step solution for this problem. No excel

Mark Gershon, owner of a musical instrument distributorship, thinks that demand for guitars may be related to the number of

television appearances by the popular group Maroon $5$ during the previous month. Gershon has collected the data shown in

the following table:

This exercise contains only parts $b,c,$ and $d.$

b$)$ Using the least$-$squares regression method, the equation for forecasting is $($round your responses to four decimal places$)$:

$Y=$

sales $($round your response to two

c$)$ The estimate for guitar sales if Maroon $5$ performed on TV $11$ times $=$

decimal places$).$

d$)$ The correlation coefficient $(r)$ for this model $=$

$($round your response to four decimal places$).$

The coefficient of determination $(r^2)$ for this model $=$

$($round your response to four decimal places$).$

The percentage of variation in sales that can be explained by TV appearances $=$

$\%($round your response to

two decimal places$).$