When rounding, if the decimals or whatever your rounding are 5 or higher, you round up. Lower than 5 (4, 3, 2, 1) you round down. We're focusing on the thousands and ten thousands place numbers here (the 0.67 in the decimal.) as we're rounding between 5.49 and 5.5.
.67 is equal to or HIGHER than .50 obviously; so your answer is 5.5.
P = # of hrs at pizza delivery job, c = # of hrs at car wash job p + c < = 20 (thats less then or equal) 10.50p + 7.50c > = 130 (thats greater then or equal)