two resistance r1(100+-1)ohm and r2 (100+-2) ohm are connected in parallel find the equivalent resistance with error (is upto appropriate significant figure). I will mark brainlist for correct answer, and spammer will be reported.​

Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.