Which number line model represents the expression -1/2 + 5/4

it would be a

Step-by-step explanation:

because on a there is a line that goes from 0 to -1/2 and a line that goes from -1/2 to -3/4 and if u add how n=many spaces that line went from -1/2 to 3/4 then u would get 5

8 2/3 is the answer

step-by-step explanation: just use a calculator

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.