sarah8479
26.10.2019 •
Mathematics
Antonio’s weekly allowance is given by the equation a=0.5c+10, where c is the number of chores he does. if he received $16 in allowance one week, how many chores did he do?
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Ответ:
Ответ:
Step-by-step explanation:
Find the last term of the sequence.
a1 = 8
d = -7
n = 30
a30 = 8 + (n - 1)*(-7)
a30 = 8 + (30 - 1)*-7
a30 = 8 + 29*-7
a30 = 8 - 203
a30 = -195
Sum = (a + L)*n/2
Sum = (8 + -195) * 30/2
Sum = - 187 * 15
Sum = - 2805