The length of a line, Lcm, is measured as 10cm correct to the nearest cm. Write down the error interval for L Need ASAP

Average acceleration: i have no idea how to do this.

Savannah is painting a striped background for a mural on a wall that is 1515 yards long. she wants a total of 9696 stripes that are all the same width. which calculation should savannah use to decide how wide to make each stripe?

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