19.
What is the $F$ in FOIL when multiplying $(3 x+5)(2 x-1) ?$

Answer

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Answer

Therefore, the 'F' in FOIL when multiplying $(3 x+5)(2 x-1)$ is $\boxed{6}$.

Steps

Step 1 ：The FOIL method stands for First, Outer, Inner, Last. It's a way for remembering how to expand the product of two binomials.

Step 2 ：The 'F' in FOIL stands for 'First', which means we need to multiply the first terms in each of the binomials.

Step 3 ：In this case, the first terms are $3x$ and $2x$.

Step 4 ：So, we multiply the first terms: $3x * 2x = 6x^2$.

Step 5 ：Therefore, the 'F' in FOIL when multiplying $(3 x+5)(2 x-1)$ is $\boxed{6}$.