Question

PLEASE HELP ME!!!!!!!!!

Answer 1

`\displaystyle 13 = b_1`

Step-by-step Step-by-step explanation:

`\displaystyle h[b_2 + b_1] / 2 = A \\ \\ 99 = 6[20 + b_1] / 2 \hookrightarrow (198)/(6) = (6[20 + b_1])/(6); 33 = 20 + b_1 \\ \\ \boxed{13 = b_1}`

OR

`\displaystyle (1)/(2)h[b_2 + b_1] = A \\ \\ 99 = (1)/(2)[6][20 + b_1] \hookrightarrow (99)/(3) = (3[20 + b_1])/(3); 33 = 20 + b_1 \\ \\ \boxed{13 = b_1}`

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