**What is the initial value $a$ of the exponential function $g(x)=-\dfrac{16}{49}\cdot\left(\dfrac{7}{2}\right)^x\ $**?
$a=$ [[☃ math-keypad 1]]
**For which value of $x$ does $g(x)=-4\ $**?
$x=$ [[☃ math-keypad 2]]
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