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grandymaker [24]
3 years ago
8

(25+3) - 7 x 3 + (2x4)

Mathematics
1 answer:
arlik [135]3 years ago
4 0

Answer:

It is not correct, the answer is 15

Step-by-step explanation:

They forgot the rule of PEMDAS, and accidentally subtracted before they multiplied. It should've gone

(25+3) - 7 x 3 + (2x4)

28-7x3+8

28-21+8

Since it's minus 21, that means it's negative, so -21+8=13

28-13=15

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A researcher asks random samples of residents of two separate counties as to whether they had purchased organically grown food i
Leni [432]

Answer:

2 proportions z test

The two populations are named as residents from the first county and residents from the second county.

Step-by-step explanation:

This is testing hypothesis about the difference between two proportions.

When the proportions are tested if they are the test statistic

z= ( p^1-p^2)- (p1-p2) / √p₁q₁/n₁ + p₂q₂/ n₂

where p^1 is the proportion of success in the first sample and   p^2 of size n₁   is the proportion of success in the second sample of size n₂ with unknown proportions of successes p1 and p2 respectively.

When the sample sizes are sufficiently large

z= ( p^1-p^2)- (p1-p2) / √p₁q₁/n₁ + p₂q₂/ n₂ is approximately standard normal.

The two populations are named as residents from the first county and residents from the second county.

7 0
3 years ago
HELP ME WITH MY MATH ASSIGNMENT, WILL GIVE ANYTHING, DUE TOMORROW! :(
nataly862011 [7]

Answer:

Answer is 225.

We have to find the sum of 15 terms of the series

sigma 1 to 15 (2n-1)

This can be split as per summation terms as

sigma 2n - sigma 1

sigma 2n can again be simplified by taking 2 outside

sigma 2n= 2 times sum of natural numbers of 1 to 15

= 2(15)(16)/2= 240

sigma 1= 1+1+...15 times= 15

Hence final answer is

= 2 times sigma n - (n) = 240-15 = 225.

Step-by-step explanation:


4 0
3 years ago
Read 2 more answers
Perform the operation. Enter your answer in scientific notation. 7 × 102 − 5.6 × 102 =
Zarrin [17]
The answer is 142.8
3 0
3 years ago
A library association plans to take an SRS of 150150150 adults from the population of adults in the US to see what proportion of
Serga [27]

Answer:

Mean: =0.76

SD= (squarerootof) 0.76(0.24)/150

Step-by-step explanation:

3 0
3 years ago
Please help me with this problem!
san4es73 [151]

Answer:

The choice A ;

\frac{1}{ {7}^{8} }

Step-by-step explanation:

\frac{ {7}^{ - 6} }{ {7}^{2} }  =  \frac{ {7}^{ - 6 - 2} }{1}  =  {7}^{ - 8}  =  \frac{1}{  {7}^{8} }  \\  \\  \\ or. \:  \frac{ {7}^{ - 6} }{ {7}^{2} }  =  \frac{1}{ {7}^{ 2 + 6} }  =  \frac{1}{ {7}^{8} }

8 0
2 years ago
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