Can someone explain to me how to do these, i dont get it.

a hair stylist worked from 8: 45 a. m. until 12: 15 p. m. and 12: 45 p. m. until 5: 15 p. m. estimate the total number of hours worked.

8 hr

7 hr 15 min

8 hr 15 min

7 hr 30 min

let x be the money she spent so that she can earn the free t-shirt.

since, she already spent $112.49

⇒

also, as per the statement: jennifer must spend $250 or more in order to qualify for a free t-shirt at the store.

then,

we have an inequality i.,e

subtract 112.49 from both sides we get;

therefore, $137. 51 more money does jennifer need to spend so that she can earn the free t-shirt