Four friends want to take a vacation together, so each one gets a part-time job. Each person has 8 weeks to save $720 for the va
2 answers:
You can use the fact that summing something P times is equal to multiplying that thing with P.
Those who could save the needed amount were:
Option A: A and C
<h3>How to add something P times?</h3>Let you have to add a value y p times. Then you write it as:
checking total money each friend earned:
- Friend A : worked 13 hours per week at $6.95/hour rate.
Since in 1 week, A works 13 hour, thus, in 8 weeks, he works
Each hour he earns $6.95, thus, for 184 hours, he will earn
Similarly,
- Friend B: worked 15 hours per work at $5.85/hour rate
B earned
- Friend C: worked 18 hours per work at $5.25/hour rate
B earned
- Friend D: worked 11 hours per work at $7.80/hour rate
B earned
Only friend A and friend C could earn more than or equal to $750
Thus,
Those who could save the needed amount were:
Option A: A and C
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ANSWER
EXPLANATION
The given sequence is
3,-5,-13,.....-229.
The first term of this sequence is
a_1=3
There is a common difference of
The last term of this sequence is -229.
The nth term of this sequence is given by:
We use the last term to determine the number of terms in the sequence.
Divide through by -8;
Hence there are thirty terms in the sequence.
The sum of the first n terms is given by:
The sum of the first 30 terms is given by: