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k(m)  =  m² - 7m - 18

k(m)  =  (m - 9)(m + 2)

The zeros are the values of  m  that make  k(m)  equal zero, so the zeros are  9  and  -2 .

C)  One positive zero and one negative zero, where the positive zero has the larger absolute value

f(x)  =  2x² - 11x + 12

f(x)  =  2x² - 8x - 3x + 12

f(x)  =  2x(x - 4) - 3(x - 4)

f(x)  =  (x - 4)(2x - 3)

The zeros are  4  and  3/2  .

D)  Two positive zeros

s(r)  =  5r² + 49r - 10

s(r)  =  5r² + 50r - 1r - 10

s(r)  =  5r(r + 10) - 1(r + 10)

s(r)  =  (r + 10)(5r - 1)

The zeros are  -10  and  1/5 .

F)  One positive zero and one negative zero, where the negative zero has the larger absolute value

z(w)  =  w² + 7w + 6

z(w)  =  (w + 6)(w + 1)

The zeros are  -6  and  -1 .

E)  Two negative zeros