The answer would be d or the last one
Answer:
<em>See Explanation</em>
Step-by-step explanation:
<em>The question is incomplete but it can still be solved.</em>
<em>To answer this question, I'll solve for the general formula which to determine Rico's donations</em>
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The given sequence shows an Arithmetic sequence; such that
The general formula (Tn) is as follows:
Substitute values for T1 and d
Open Bracket
Collect Like Terms
X=quarters, y=dimes
7+2x=y
0.25x+0.1y=10.15
we substitute the first equation into the second equation
0.25x+0.1(7+2x)=10.15
0.25x+0.7+0.2x=10.15
0.45x+0.7-0.7=10.15-0.7
0.45x=9.45
0.45x/0.45=9.45/0.45
x=21 quarters
7+2x=y, x=21
7+2(21)=y
7+42=y
y=49 dimes
check: 0.25x+0.1y=10.15 when x=21, y=49
21(0.25)=5.25 in quarters
49(0.1)=4.90 in dimes
5.25+4.90=10.15
2/5-1/4
8/20 - 5/20
(8-5)/20
= 3/20
I hope that's help ! if you have question please ask
The answer is 8 different combinations because you would take 3 times 5