I'm not sure how to find the expressions for 7

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter1: Variables, Expressions, And Integers
Section1.2: Powers And Exponents
Problem 2E
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I'm not sure how to find the expressions for 7 and 8. Could I get some help please?

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As two Questions are posted, I will solve only one:

7. As the acceleration is decreasing, the upper estimate will be found using end points

t=1

Upper estimate for speed = t32.00+19.41+11.77+7.14+4.33=1×74.65 ft/sec =74.65 ft/sec

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