What is the sum of the geometric series in which a1 = −4, r = 2, and an = −128?

hint: r ≠ 1, where a1 is the first term and r is the common ratio.
sn = 1,020
sn = −252
sn = 43,690
sn = −1,020

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Formulate the indicated conclusion in nontechnical terms. be sure to address the original claim. the foundation chair for a hospital claims that the mean number of filled overnight beds is over 523, and she is therefore justified starting a funding campaign to add a wing to the hospital. assuming that a hypothesis test has been conducted and that the conclusion is failure to reject the null hypothesis, state the conclusion in nontechnical terms.