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2 years ago

Divide 4,671 divided by8

Mathematics

1 answer:

Xelga [282]2 years ago

8 0

Answer:

its: 583.875

Step-by-step explanation:

Please give me brainlist

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Find the sum (-8z+4)+(8z-7)

padilas [110]

Answer:

-3

Step-by-step explanation:

8 0

3 years ago

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This is kinda confusing can someone help explain!!

AURORKA [14]

Answer: all i can say is this for an edu guess

2 6 and 4 would be 40 or 30

3 5 and 7 would be 110 or 120

8 would be 20 or 10

also this was the first answer

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3 years ago

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Multiply. Write your answer as a fraction in simplest form. −1/4×(−4/3)=

Sophie [7]

Answer:

$\frac{1}{3}$

Step-by-step explanation:

Given

- $\frac{1}{4}$ × - $\frac{4}{3}$ ( negative times negative = positive )

= $\frac{1}{4}$ × $\frac{4}{3}$ ( cancel the 4 on the numerator and denominator )

= $\frac{1}{3}$

5 0

3 years ago

If Sally earned $630 in interest when investing $1200 at a rate of 15% per year, how many years have passed?

jasenka [17]

630/1200*0.15=3.5.........

5 0

3 years ago

How to solve this question

VMariaS [17]

The variance method is as follows.

-Sum the squares of the values in data set, and then divide by the number of values in data set
- From that, subtract the square of the mean (add all values and divide by number of values in the data set)

Our variance is

 $\displaystyle\sigma^2 = \frac{2^2 + 5^2 + m^2}{3} - \left(\frac{2 + 5 + m}{3}\right)^2$

Since variance has to be 14, we set $\sigma^2 = 14$ and solve for m

$14= \frac{4 + 25 + m^2}{3} - \left(\frac{7 + m}{3}\right)^2\ \Rightarrow \\ \\
14 = \frac{29}{3} + \frac{1}{3}m^2 - \frac{1}{9}(7+m)^2 \\ \\
14 = \frac{29}{3}+ \frac{1}{3}m^2 - \frac{1}{9}(49 + 14m + m^2) \\ \\
14 = \frac{29}{3}+ \frac{1}{3}m^2 - \frac{49}{9}- \frac{14}{9}m- \frac{1}{9}m^2 \\ \\
0 = \frac{-88}{9} -\frac{14}{9}m + \frac{2}{9}m^2
$

quadratic formula

$m = \displaystyle\frac{-b \pm \sqrt{b^2 -4ac}}{2a} \\
m = \frac{-(-\frac{14}{9}) \pm \sqrt{\left(-\frac{14}{9}\right)^2 - 4(2/9)(-88/9)} }{2(2/9)} \\
m = \frac{\frac{14}{9} \pm \sqrt{ \frac{196}{81} + \frac{704}{81} } }{\frac{4}{9} } \\
m = \frac{\frac{14}{9} \pm \sqrt{ \frac{900}{81} } }{\frac{4}{9} } \\
m = \frac{\frac{14}{9} \pm \sqrt{ \frac{100}{9} } }{\frac{4}{9} } \\
m = \frac{\frac{14}{9} \pm \frac{10}{3} }{\frac{4}{9} } \\
m = 11, -4$

-4 doesnt' work as it is not a positive integer

m = 11

5 0

3 years ago