2 years ago

I need help please

Mathematics

1 answer:

emmainna [20.7K]2 years ago

3 0

Answer:

1+1=2

Step-by-step explanation:

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The drying times for a certain type of cement are normally distributed with a standard deviation of 30 minutes. A researcher wis

IceJOKER [234]

Answer:

h. 36

Step-by-step explanation:

For a 68.26% confidence, z = 1.0.

Standard deviation (s) = 30 minutes

The sample size needed to assure that the sample mean does not differ from the true mean by more than 5 minutes is given by:

$5\geq z*\frac{s}{\sqrt n}\\\sqrt n\geq 1*\frac{30}{5}\\n\geq 36$

The sample size needed is 36.

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3 years ago

a friend is having trouble with exponents and asks you to review some worked probelems look over the problems and correct any mi

Stella [2.4K]

We have the following expression:

$2x^2y\cdot3x^5y^2$

By combining similar terms, we get

$2\cdot3\cdot x^2\cdot x^5\cdot y\cdot y^2$

now, 2 times 3 is 6 and to add exponents, both the exponents and variables should be alike:

$x^2\cdot x^5=x^{2+5}=x^7$

Similarly,

$y\cdot y^2=y^{1+2}=y^3$

Therefore, the answer is

$6x^7y^3$

4 0

1 year ago

Convert the following equation into slope intercept form. 3x + 21y = 21 Stars

RideAnS [48]

Answer:

y = -(1/7)x + 1

Step-by-step explanation:

$3x + 21y = 21 \\ 21y = 21 - 3x \\ y = \frac{21 - 3x}{21} \\ y = 1 - \frac{1}{7} x \\ y = - \frac{1}{7} x + 1$

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3 years ago

A door to a playhouse is 50 inches tall. Which of the following is another measure equal to the height?

sashaice [31]

Answer:

A. 4 ft 2 in.

Step-by-step explanation:

50/12 = 4.1666667. Round up, so 4.1666667 becomes 4.2.

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3 years ago

Read 2 more answers

Whats 387 rounded to the nearests 100

torisob [31]

I rounded it and the answer is 400

4 0

3 years ago

I need help please ​

I need help please