To find the value of F when C is 117, we can use the given formula:
C = 5/9 • (F - 32)
Let's substitute C with 117 and solve for F.
117 = 5/9 • (F - 32)
To isolate F, we can start by multiplying both sides of the equation by 9/5 to cancel out the fraction:
(9/5) • 117 = F - 32
Now we can simplify the left side:
(9/5) • 117 = (9 • 117) / 5 = 1053 / 5
Adding 32 to both sides to isolate F:
(1053 / 5) + 32 = F
To simplify further, we can convert 32 to a fraction with a denominator of 5:
(1053 / 5) + (32 * 5 / 5) = F
(1053 / 5) + (160 / 5) = F
Now we can add the fractions together:
(1053 + 160) / 5 = F
1213 / 5 = F
Finally, we can simplify and find the value of F:
F = 1213 / 5 = 242.6
Therefore, when C is 117, F is approximately 242.6 degrees Fahrenheit.