2 years ago

Which number line correctly shows 0.8 + 0.3? Help

Mathematics

1 answer:

Aliun [14]2 years ago

6 0

Answer:

search it up please :)

Step-by-step explanation:

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A bathtub can hold 80 gallons of water. The faucet flows at a rate of 4 gallons per minute. What percentage of the tub will be f

krok68 [10]

Answer:

120

Step-by-step explanation:

80 divided by 2 is 40 plus 80 would be 120 which is 6 minutes worth of filling

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2 years ago

HELP ME PLS<br> if y varies inversely with x, and y = 15/2 when x = 4, find x when y = 15/4

SCORPION-xisa [38]

Y=1/x
y=k/x
Where “k” is a constant
15/2=k/4
2k=60
k=60/2
k=30
:. 15/4=30/x
15x=120
x=120/15
:.x=8.

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2 years ago

A population is estimated to have a standard deviation of 9. We want to estimate the population mean within 2, with a 99% level

cupoosta [38]

Answer:

The sample required is $n = 135$

Step-by-step explanation:

From the question we are told that

The standard deviation is $\sigma = 9$

The margin of error is $E = 2$

Given that the confidence level is 99% then the level of significance is mathematically evaluated as

$\alpha = 100-99$

$\alpha = 1 \%$

$\alpha = 0.01$

Next we will obtain the critical value $\frac{\alpha }{2}$ from the normal distribution table(reference math dot armstrong dot edu) , the value is

$Z_{\frac{\alpha }{2} } = Z_{\frac{0.05 }{2} } = 2.58$

The sample size is mathematically represented as

$n = [ \frac{Z_{\frac{\alpha }{2} } * \sigma }{E} ]^2$

substituting values

$n = [ \frac{ 2.58 * 9 }{2} ]^2$

$n = 135$

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2 years ago

What figures have rotation symmetry? PLEASE HELP I NEED A GOOD GRADE

Ivanshal [37]

The figures on the top left and the bottom right have rotational symmetry.

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Please Help!! Thank you so much!!

STatiana [176]

It’s the last one 7 sqrt5+8sqrt2/27

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2 years ago