Math help! Answers please?

Find the x-intercept and y-intercept of the line. 3x + 5y = −15

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%