Ascience class measured the mass of a balloon to be 4 grams. after the balloon was inflated the mass was 8 grams. what was the mass of the air inside the inflated balloon?

Jack lives on a farm and has a large backyard. the area of his rectangular backyard is of a square mile. if the width of the yard is of a mile, what fraction of a mile is the length of the rectangular backyard?

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 (monthly car loan payment per $1,000 borrowed) i need !

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"