Campbell

I cannot figure out the equation and answer to the following. Can someone help please. A 25.0 mL solution of HCl has been spilled. It took 21.8 mL of saturated 2.5 M NaOH to neutralise the acid. What was the molar concentration of the acid?

a safety harness is connected to a cable with a report breaking stress of 800MNm2. what mass could be hung from a harness if the diameter of the cable was 6mm. how do I work this out?

what are the possible numbers of imaginary roots a 6th-degree function can have?

An egg is thrown of the top of a building. Its height in meters above the ground can be approximated by the polynomial 300 + 2t - 4.9t2 (the second t has a exponent of 2) where t is the time since it was thrown in seconds?

I don't understand