I need help answering the following question using R:

Consider the gain in weight of 19 female rats between 28 and 84 days after birth. 12 were fed on a high protein diet and 7 on a low protein diet. Using the following data, test the hypothesis that there is no difference in weight gain between female rats raised on a high- protein diet versus those raised on a low-protein diet. Use a significance level of = 0.05 and assume equal variances. ("Hint: var.equal=TRUE")