Tatenda takes ttt seconds to mow a square meter of lawn and Ciara takes ccc seconds to mow a square meter of lawn. Tatenda mows 700700700 square meters of lawn per week and Ciara mows 750750750 square meters of lawn per week.
Which expressions can we use to describe how many more seconds Tatenda spends than Ciara spends mowing lawns during 444 weeks?
Choose 2 answers:
A: 4(750c-700t)
B: 3000c+2800t
C: 2800t-3000c
D: 4(700t-750c)
Answers
Answer:
Refers to the attachment
The expression used to calculate how many more seconds Tatenda spends than Ciara spends mowing lawns during 4 weeks is 4(700t- 750c)
Option D is the correct answer.
Given:
time taken by tatenda to mow a square meter of lawn = t seconds
time taken by Ciara to mow a square meter of lawn = c seconds
area mowed by tatenda in a week = 700 square meters
area mowed by Ciara in a week = 750 square meters
To find:
the expression used to calculate how many more seconds Tatenda spends than Ciara spends mowing lawns during 4 weeks
Solution:
time taken by tatenda for mowing in 4 weeks = 4 * 700 * t seconds
time taken by Ciara for mowing in 4 weeks = 4 * 750 * c seconds
more seconds Tatenda spends than Ciara spends mowing lawns during 4 weeks = [4 * 700 * t ] - [4 * 750 * c]
= 4(700t- 750c)
Therefore, the expression used to calculate how many more seconds Tatenda spends than Ciara spends mowing lawns during 4 weeks is 4(700t- 750c)
Option D is the correct answer.
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