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3 years ago

Which expression is equivalent to 2x +(-7) - 2x - (-2)?

Mathematics

2 answers:

qwelly [4]3 years ago

6 0

Answer:

-5

Step-by-step explanation:

Luba_88 [7]3 years ago

6 0

-5 because it is the answer

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George has a bag with 4 mint sticks, 3 jelly treats, and 13 fruit tart chews. If he eats one piece every 5 minutes, what is the

slega [8]

Answer:

12/625 or 1.9%

Step-by-step explanation:

Adding all of the candy pieces together, you get 25, the denominator.

3/25*4/25=12/625

12/625=.0192

.0192*100=1.92%

5 0

4 years ago

A tessellation is an arrangement of repeating shapes that have what characteristic

vladimir1956 [14]

they fill a plane --- finite or infinite without gaps or overlaps
AND

no spaces or overlaps exist between its pieces

sorry if im wrong

8 0

3 years ago

Read 2 more answers

986÷8= <br> Me give Brainlyest.

RUDIKE [14]

Answer:

The answer is 123.25.

Step-by-step explanation:

I hope this helps!

6 0

3 years ago

Read 2 more answers

The Bay Area Online Institute (BAOI) has set a guideline of 60 hours for the time it should take to complete an independent stud

yarga [219]

Answer:

At the 5% level, BAOI can infer that the average time to complete does not exceeds 60 hours.

Step-by-step explanation:

From the question we are told that

The population mean is $\mu = 60 \ hr$

The sample size is $n = 16$

The sample mean is $\= x = 68 \ hr$

The standard deviation is $\sigma = 20 \ hr$

The null hypothesis is $H_o : \mu = 60$

The alternative $H_a : \mu > 60$

Here we would assume the level of significance of this test to be

$\alpha = 5\% = 0.05$

Next we will obtain the critical value of the level of significance from the normal distribution table, the value is $Z_{0.05} = 1.645$

Generally the test statistics is mathematically represented as

$t = \frac{ \= x - \mu}{ \frac{ \sigma }{\sqrt{n} } }$

substituting values

$t = \frac{ 68 - 60 }{ \frac{ 20 }{\sqrt{16} } }$

$t = 1.6$

Looking at the value of t and $Z_{\alpha }$ we see that $t< Z_{\alpha }$ hence we fail to reject the null hypothesis

This means that there no sufficient evidence to conclude that it takes more than 60 hours to complete the course

At the 5% level, BAOI can infer that the average time to complete does not exceeds 60 hours.

6 0

3 years ago

A laser pointer in the shape of a cylinder is 13 centimeters long with a radius of 1 centimeter. On top it has a cone-shaped tip

ivann1987 [24]

We know that
volume of a cylinder=pi*r²*h
where
h=13 cm
r=1 cm
volume of a cylinder=pi*1²*13----> 13*pi cm³

volume of a cone=(1/3)*pi*r²*h
where
r=1 cm
h=3 cm
volume of a cone=(1/3)*pi*1²*3-----> pi cm³

volume of<span> the laser pointer=13*pi+pi-----> 14*pi cm</span>³

6 0

4 years ago