7. The sum of the first two terms of a geometric sequence is 36 and the product of the first and third terms is 9 times the second term. Find the sum of the first 8 terms.​

step-by-stp

the correct answer is the section c

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

exa:

)

3+11

14

step-by-step explanation:

from this example, we can see that subtracting with integers is the same as adding the opposite. we can solve using a number line or by using the saying "keep, change, change" to us solve. it is important to remember that we can subtract a negative and end up with a larger number than we started with.