Answer:
-11 to the power of 3
Step-by-step explanation:
Step 1: Divide both sides by two.
(As shown where 12x - 6 = 10 becomes halved to become 6x – 3 = 5)
Step 2: Add 3 to both sides.
(The 3 is brought to the other side to add to 5, becoming 8)
Step 3: Multiply both sides by 1/6.
(aka dividing both sides by 6, to get the fraction 8/6 which can be simplified to 4/3.)
9×105=945 and 9×107=963, so 945×963=90,135
I'm going to assume you mean Heart Rate. Depending on how his body takes exercise and the extent of the exercise, it should be around 140 to 155 bpm. around his age and assuming he has no heart problems (and is really healthy in general) his normal bpm would be 110 but when exercising it should be 140 to 155 bpm.