First off, you have to convert 8 minutes into seconds. A minute is <em>60 seconds</em>, so multiply 60 by 8. 60×8=480 Now, change 10⁹ into a standard number. Since the number is 10 that is to have an exponent, the exponent, in this case 9, indicates how many zeros are in the standard number. 10⁹=1,000,000,000 So, multiply 480 by 1,000,000,000. 480×1,000,000,000=480,000,000,000 So, the answer is 480,000,000,000.
After 1.4 seconds, t = 1.4. h(t) = 150 - 9(1.4) Multiply 9 by 1.4 to get 12.6. h(t) = 150 - 12.6 Subtract 12.6 from 150 to get 137.4. h(t) = 137.4. The height of the ball would be 137.4 after 1.4 seconds. Hope this helps!
