First, realize that angle ABC is the sum of the two other angles. Hence, form an equation in which you subtract the measure of one of the angles from angle ABC to get the measure of the other angle -- the one you are solving for.
Answer:
![a + b = 5 \\ a \: = 5 - b \\ a - b = 4 \\ 5 - b - b = 4 \\ 5 - 2b = 4 \\ 5 - 4 = 2b \\ 1 = 2b \\ \frac{1}{2} = \frac{2b}{2} \\0.5 = b \\ b = 0.5 \\ a = 5 - b \\ = 5 - 0.5 \\ = 4.5 \\ {a \: }^{2} - {b}^{2} = ( {4.5}^{2}) - ( {0.5}^{2} ) \\ = 20.25 - 0.25 \\ = 20 \\ {a}^{2} - {b}^{2} = 20](https://tex.z-dn.net/?f=a%20%2B%20b%20%3D%205%20%5C%5C%20a%20%5C%3A%20%20%3D%205%20-%20b%20%5C%5C%20%20a%20-%20b%20%3D%204%20%5C%5C%205%20-%20b%20-%20b%20%3D%204%20%5C%5C%205%20-%202b%20%3D%204%20%5C%5C%205%20-%204%20%3D%202b%20%5C%5C%201%20%3D%202b%20%5C%5C%20%20%5Cfrac%7B1%7D%7B2%7D%20%20%3D%20%20%5Cfrac%7B2b%7D%7B2%7D%20%20%5C%5C0.5%20%3D%20b%20%5C%5C%20%20b%20%3D%200.5%20%5C%5C%20a%20%3D%205%20-%20b%20%5C%5C%20%20%3D%205%20-%200.5%20%5C%5C%20%20%3D%204.5%20%5C%5C%20%20%7Ba%20%5C%3A%20%7D%5E%7B2%7D%20%20-%20%20%7Bb%7D%5E%7B2%7D%20%20%3D%20%28%20%7B4.5%7D%5E%7B2%7D%29%20%20-%20%28%20%20%7B0.5%7D%5E%7B2%7D%20%29%20%20%5C%5C%20%20%3D%2020.25%20-%200.25%20%5C%5C%20%20%3D%2020%20%5C%5C%20%20%7Ba%7D%5E%7B2%7D%20%20-%20%20%7Bb%7D%5E%7B2%7D%20%20%3D%2020)
Step-by-step explanation:
HOPE THAT THIS IS HELPFUL.
HAVE A GREAT DAY.
the right answer is first one
Sum of a finite geometric series=a(r^(n) -1)/(r -1)
or
sum of a finite geometric series=a(1 - r^(n))/(1 - r)
the Smiths would spend a total of $2928.2 on clothing in 4 years
Answer:
21
Step-by-step explanation:
because they all sum up together