3 years ago

Which of the following is equal to (-2) -5 ?

Mathematics

2 answers:

zysi [14]3 years ago

4 0

Answer:

Step-by-step explanation:

-3 would be the correct answer

Sunny_sXe [5.5K]3 years ago

3 0

Answer: -7

Step-by-step explanation:

(-2)-5

A negative and a negative will add together.

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Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. Suppose 188 students take the exam

charle [14.2K]

The mean is $\mu=85$ and standard deviation is $\sigma=5$ . Then the variable $X\sim N(85,5)$ .

Use substitution $Z=\dfrac{X-\mu}{\sigma}=\dfrac{X-85}{5}$ , then the variable $Z\sim N(0,1)$ .

The probability $Pr(X>80)$ can be calculated in the following way:

for X=80, $Z=\dfrac{80-85}{5} =-1$ and $Pr(X>80)=Pr(Z>-1)$ . From the diagram $Pr(Z>-1)=0.34+0.34+0.135+0.025=0.84$ .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

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3 years ago

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Solve the following system of equations: x + 3y = −4 x + 5y = −6 pls and thx

Agata [3.3K]

Answer:

x = -1 y = -1

Step-by-step explanation:

x + 3y = −4

x + 5y = −6

Multiply the first equation by -1

-x - 3y = 4

The add to the second equation to eliminate x

-x - 3y = 4

x + 5y = −6

--------------------

2y = -2

Divide by 2

2y/2 = -2/2

y = -1

Now solve for x

x+3y = -4

x +3(-1) = -4

x -3 = -4

Add 3 to each side

x-3+3 = -4+3

x = -1

4 0

3 years ago

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Solve 1/2x times 1/4x-18=6.

SashulF [63]

Answer:

The answer is 48

Step-by-step explanation:

Have a nice day

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2 years ago

Leah's softball team has $437 to spend on equipment. They want to buy 5 gloves that cost $84 each. Leah needs to know if they ha

WITCHER [35]

Answer:

yes she will have enough, they will have 17 dollars left

Step-by-step explanation:

84 times 5 is 420 so she will have enough

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2 years ago

Can someone give me the answer to all 3 of those

Verizon [17]

Answer:

sorry bro but i suck at math

Step-by-step explanation:

good luck tho =)

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2 years ago