Plsss help! worth so many points​

A+b→2c when the reaction begins, the researcher records that the rate of reaction is such that 1 mole of a is consumed per minute. after making changes to the reaction, the researcher notes that 2 moles of a are consumed per minute. what change could the researcher have made to effect this change?

What human activity increases beach erosion?

Is 343 in the sequence -5, -2, 1, 4, 7