Can someone help explain which triangle is labeled correctly

The table represents a linear function. what is the slope of the function? –6 –4 4 6

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read