Is there a relation between time (in hours) a machinery operates and the time (in hours) the machinery requires repair?

Please use the following Excel print-outs to answer the questions.

SUMMARY OUTPUT
Regression Statistics
Multiple R	0.797294
R Square	0.635677
Adjusted R Square	0.599245
Standard Error	6.836855
Observations	12

	Coefficients	Standard Error	t Stat	P-value
Intercept	26.15	7.067868	3.700007	0.004108
Operation	0.019	0.00464	4.177105	0.001896

A- Write down the equation of the least squares regression line to predict the reparation time from operation time.

b- Predict the reparation time when operation time is 1300 Hs