a= 5.6 (to 1 dp). b=24.1 (to 1 dp). c=145 (to 3sf). d=0.34 (to 2 dp)
calculate the upper and lower bounds for each of the following to 3 significant figures.
1- a^2
2- b^3
3- cd^3
4- a^2 + b^2
5- c/b^2