14. There are 12 marbles in a bag. Of these, Four of them are blue and the rest are green. You reach into the bag and take out t
1 answer:
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[ Answer ]
[ Explanation ]
- Formula For Area Of Trapezoid:
-----------------------------------------
A = 10
B = 18
H = 6
- Plug Numbers Into Equation:
- Solve
10 + 18 = 28
28 ÷ 2 = 14
14 · 6 = 84
- Final Answer
84
Answer:
see explanation
Step-by-step explanation:
The sum to n terms of an arithmetic sequence is
=
[ 2a₁ + (n - 1)d ]
where a₁ is the initial value and d the common difference
Given
=
[ 10 + (n - 1)3 ]
Then by comparison
2a₁ = 10 ( divide both sides by 2 )
a₁ = 4 ← initial value
and d = 3 ← common difference
Thus
=
[ 10 + (7 × 3) ]
= 4(10 + 21)
= 4 × 31
= 124