In Quiz 1.3 you created two numeric vectors, v1 and v2, each of length 4. Combine them together to make a matrix with 4 rows and two columns, saving it to a variable "m"
m = cbind(v1, v2)
Add a row to the end of your matrix m, with the values 8 and 12, saving it to the variable m2
m2 = rbind(m, c(8, 12))
Extract the first two rows of m2
m2[1:2, ]
Extract the second column of m2
m2[, 2]