What do you need help with
Answer:
It will take 5 months to save the money to buy a video game system
Step-by-step explanation:
Tammi is planing to buy a video game system for $310. Each month she doubles the amount she saves the previous month. This means that the amount that she has for each month is increasing in geometric progression. The formula for the sum of n terms of a geometric sequence is expressed as
Sn = a(r^n - 1)/r - 1)
Where
r is the common ratio
a is the first term
n is the number of terms
From the information given,
a = $10
r = 2
Sn = 310 (cost of the video game system)
n is the number of years. Therefore
310 = 10(2^n - 1)/(2 - 1)
31 = 2^n - 1
2^n = 32
2^n = 2^5
n = 5
For every 21 minutes that people spend using their cell phone, the number of texts they send increases by 5.
(I just did the test)
The mistake she had done is she should have reversed the inequality as per the division property of inequality.
<h3>What is inequality?</h3>
A statement of an order relationship—greater than, greater than or equal to, less than, or less than or equal to—between two numbers or algebraic expressions.
The inequality is:
500 − 30x ≥ 200 −500 −500 −30x ≥ −300 x ≥ 10
Given:
Jamie had $500 in her savings account.
She wants to have at least $200 left in the account at the end of the school year.
The inequality she had done is
500 − 30x ≥ 200 −500 −500 −30x ≥ −300 x ≥ 10
But when she was dividing she should have reversed the inequality as per the division property of inequality.
Learn more about this concept here:
brainly.com/question/18648781
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