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Part $1$

Let

$$h$($x$)$equals$=$x squared minus $6$ xx$26$x$.$

$($a$)$ Find the average rate of change from

$55$

to

$99.$

$($b$)$ Find an equation of the secant line containing

left parenthesis $5,$ h left parenthesis $5$ right parenthesis right parenthesis$(5,$h$(5))$

and left parenthesis $9,$ h left parenthesis $9$ right parenthesis right parenthesis $.$