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andrey2020 [161]
3 years ago
11

Maria earned $126 in simple interest from her savings account. If she invested $450 for 7 years, what was the interest rate?

Mathematics
2 answers:
xeze [42]3 years ago
8 0
Answer is <span>4%

450 * 7 * i = 126
3150 i = 126
i = 126/3150
i = 0.04

0.04 = 4%

</span>
a_sh-v [17]3 years ago
6 0
4% will be the answer
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There are 169 million registered voters in the us. determine an interval for the number (how many) of registered democrats in th
VashaNatasha [74]
Part A:

Given that in a sample of 400 registered voters, 204 were democrats, i.e. n = 400, <span>\hat{p}= \frac{204}{400} =0.51

</span>The 95% confidence interval for the proportion of registered democrats voters in the population is given by:

95\%\ C.I.=\hat{p}\pm z_{\alpha/2}\sqrt{\frac{\hat{p}(1-\hat{p})}{n}} \\  \\ =0.51\pm1.96\sqrt{\frac{0.51(1-0.51)}{400}}=0.51\pm1.96\sqrt{\frac{0.2499}{400}} \\  \\ =0.51\pm1.96(0.025)=0.51\pm0.049=(0.51-0.049,\ 0.51+0.049) \\  \\ =\bold{(0.461,\ 0.559)}



Part B:

Given that t<span>here are 169 million registered voters in the US, the interval for the number of registered democrats in the population is given by

[0.461(169,000,000), 0.559(169,000,000)] = (77,909,000, 94,471,000)
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6 0
3 years ago
Can someone help me pls
KatRina [158]

Answer:

x=5

Step-by-step explanation:

x=5 hope this helps!

8 0
3 years ago
A worker gets paid overtime at the rate of normal time plus one third. One week he works 40 hours of normal time and 6 hours ove
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Answer:

$ 720

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Overtime: 15 x 1/3 = $5 + $15 = $20

(40 x 15) + (6 x 20) = 600 + 120

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2 years ago
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Neporo4naja [7]
Number ten is 60 73+36=108
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3 years ago
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