The arithmetic sequence a_ia i

a, start subscript, i, end subscript is defined by the formula:
a_1 = -4910a
1

=−4910a, start subscript, 1, end subscript, equals, minus, 4910
a_i = a_{i - 1} + 8a
i

=a
i−1

+8a, start subscript, i, end subscript, equals, a, start subscript, i, minus, 1, end subscript, plus, 8
Find the sum of the first 575575575 terms in the sequence.

Find the domain of the following expression: 1/(√x)-2

Rewrite so the subject can be y in the formula d=m-y/y+n

Titus works at a hotel. part of his job is to keep the complimentary pitcher of water at least half full and always with ice. when he starts his shift, the water level shows 4 gallons, or 128 cups of water. as the shift progresses, he records the level of the water every 10 minutes. after 2 hours, he uses a regression calculator to compute an equation for the decrease in water. his equation is w –0.414t + 129.549, where t is the number of minutes and w is the level of water. according to the equation, after about how many minutes would the water level be less than or equal to 64 cups?