UPPER AND LOWER BOUNDS
a house is valued at £210000 correct to 2 significant figures
a) what is the lowest possibly value of the house
b) what is the highest possible value of the house

9514 1404 393

Step-by-step explanation:

Essentially, you add or subtract 5 in the place where there would be a third significant digit.

Technically, you can't add 5,000, because that would round up to £220,000, so you can only add 4,999. (If you feel the need to take it to the penny, you can also add 0.99.)

a) lowest: £210,000 -5,000 = £205,000

b) highest: £210,000 +4,999 = £214,999

answer: on graphs, the open and closed circles, or vertical asymptotes drawn as dashed lines us identify discontinuities.

as before, graphs and tables allow us to estimate at best.

when working with formulas, getting zero in the denominator indicates a point of discontinuity.

when working with piecewise-defined functions, check for discontinuities at the transition points where one piece ends and the next begins.

step-by-step explanation: