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2 years ago

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

Mathematics

1 answer:

Alik [6]2 years ago

4 0

Answer:

answer is 4%

Step-by-step explanation:

use formula Interest = Principal x Rate x Time

126 = 450 · 7 · r

126 = 3150 r

r = .04

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Elena L [17]

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2 years ago

A simple random sample of size nequals57 is obtained from a population with muequals69 and sigmaequals2. Does the population nee

dusya [7]

Answer:

The population does not need to be normally distributed for the sampling distribution of $\bar{X}$ to be approximately normally distributed. Because of the central limit theorem. The sampling distribution of $\bar{X}$ is approximately normal.

Step-by-step explanation:

We have a random sample of size $n = 57$ from a population with $\mu = 69$ and $\sigma = 2$ . Because n is large enough (i.e., n > 30) and $\mu$ and $\sigma$ are both finite, we can apply the central limit theorem that tell us that the sampling distribution of $\bar{X}$ is approximatelly normally distributed, this independently of the distribution of the random sample. $\bar{X}$ is asymptotically normally distributed is another way to state this.

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2 years ago

A scuba diver descends from the surface at a rate of 28 feet per minute.

Mrrafil [7]

Answer:

168 ft below sea level, or -168

Step-by-step explanation:

28 feet per minute

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4 0

2 years ago

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if $240 is invested at an interest rate of 9% per year and is compounded monthly, how much will the investment be worth in 14 ye

mote1985 [20]

The formula is
A=p (1+r/k)^kt
A future value?
P present value 240
R interest rate 0.09
K compounded monthly 12
T time 14 years
A=240×(1+0.09÷12)^(12×14)
A=842.13

3 0

2 years ago

Sarah the cheetah ran 100 meters at a speed of 16.8 meters per second. An olympian ran the 100-meter dash in 9.6 seconds. How mu

EastWind [94]

Given that Sarah the cheetah ran 100 meters at a speed of 16.8 meters per second.

An olympian ran the 100-meter dash in 9.6 seconds.

Then speed of olympian = distance/ time = 100 meter/ 9.6 seconds = 100 meter/ 9.6 seconds = 10.4166666667 meter/ seconds

whis is approx 10.42 meter/seconds

Now we need to find about how much faster was Sarah the cheetah’s speed, to the nearest tenth of a meter per second.

16.8-10.42 = 6.38 = 6.4

Hence speed of Sarah the cheetah's is approx 6.4 meter per second more than the speed of olympian.

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2 years ago

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