WeBWorK using host: https://webwork-ptx.aimath.org, format: simple seed: 161

When you exercise, your heart rate should increase until it reaches your target heart rate. The table shows target heart rate, $r = f(a) \text{,}$ as a function of age.

$a$	20	25	30	35	40	45	50	55	60	65	70
$r$	150	146	142	139	135	131	127	124	120	116	112

Find $f(25)$ and $f(50) \text{.}$
$f(25)=$
$f(50)=$

Find a value of $a$ for which $f(a) = 135 \text{.}$
$a=$

$a$	20	25	30	35	40	45	50	55	60	65	70
$r$	150	146	142	139	135	131	127	124	120	116	112

$a$	20	25	30	35	40	45	50	55	60	65	70
$r$	150	146	142	139	135	131	127	124	120	116	112

$a$	20	25	30	35	40	45	50	55	60	65	70
$r$	150	146	142	139	135	131	127	124	120	116	112