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Mazyrski [523]
3 years ago
8

Sandra saves 10% of her salary for retirement. This year her salary was $2,000 more than in the previous year, and she saved $4,

400. What was her salary in the previous year?
Complete the equation. 0.10(x + ____) = 4,400

Sandra's salary in the previous year was _____.


HELPPP ITS DUEE TODAYY
Mathematics
2 answers:
GalinKa [24]3 years ago
5 0
The equation is 0.10 (x+2,000)= 4,400
Answer: 42000
In-s [12.5K]3 years ago
3 0
42000 there hope it helps!
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Step-by-step explanation:

Suppose you take a 15 question True or False quiz and you guess on every problem. You only get 3 correct. Then

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P(\text{3 or fewer})\\=P(0)+P(1)+P(2)+P(3)\\ \\=C^{15}_0p^0q^{15-0}+C^{15}_1p^1q^{15-1}+C^{15}_2p^2q^{15-2}+C^{15}_3p^0q^{15-3}\\ \\=1\cdot q^{15}+15pq^{14}+105p^2q^{13}+455p^3q^{12}\\ \\=(0.8)^{15}+15\cdot 0.2\cdot (0.8)^{14}+105\cdot (0.2)^2\cdot (0.8)^{13}+455\cdot (0.2)^3\cdot (0.8)^{13}\\ \\\approx 0.648

Using the criteria that a number 3 is unusually low if P(3 or fewer) ≤ 0.05, we can state that 3 is not an unusually low number of correct guesses.

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