A student is measuring the effect that surface area has on the rate of chemical weathering. He dissolves several 5-gram
samples of calcite in an acid. The samples range from a single rock, to several small pieces, to a fine powder. He observes
that the 5 grams of powder dissolve the fastest, and the single 5-gram rock dissolves the slowest. Based on this
information, how might mechanical weathering affect the rate of chemical weathering?

To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x? 6x + 5y = 2 4x + 2y = 8 a) subtract 2 times the second equation from 3 times the first equation b) subtract 3 times the second equation from 2 times the first equation c) subtract 5 times the second equation from 2 times the first equation d) subtract 2 times the second equation from 5 times the first equation