Use photo math for that 21
128.59943 rounds to about 128.599 because the next decimal is a 4 and your round down below 5.
Answer:
x = 1
Step-by-step explanation:
7x - 3 = 4x
-3 = 4x - 7x
-3 = -3x
x = 1
The equation for a sequence is
an=a1+(n-1)d
Replace the variable with what you were given you get
37=-13+(n-1)5
Simplify
37=-13+5n-5
Combine like terms
37=5n-18
Reverse operations
55=5n
Simplify
n=11
Tan^-1 = 72.81° is your answer, use basic SOHCAHTOA functions
