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attashe74 [19]
3 years ago
12

The current temperature in Smalltown is 20°F. This is 6 degrease less than twice the temperature that it was six hours ago. What

was the temperature in Smalltown six hours ago?
Mathematics
1 answer:
jeyben [28]3 years ago
7 0

Answer:

<em>The temperature six hours ago was 13 °F</em>

Step-by-step explanation:

Six hours ago the temperature was x degrees.

The temperature now is "6 degrees less than twice the temperature that it was six hours ago."

The temperature now is 2x - 6.

The temperature now is 20 deg.

2x - 6 = 20

2x = 26

x = 13

Answer: The temperature six hours ago was 13 °F.

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Asha and Lucy are selling pencils in a school shop.
Akimi4 [234]

Step-by-step explanation:

7x+22=2(5x+2)

7x+22=10x+4 (-7x)

3x+4=22 (-4)

3X=18 (divide by 3)

X=6 pencils

check if the number is correct

asha= 7*6=42 42+22 is 64

Lucy= 5*6=30 30+2 is 3264/32 is 2

asha= 7*6=42 42+22 is 64Lucy= 5*6=30 30+2 is 3264/32 is 2there fore asha sells twice as many as Lucy

8 0
3 years ago
1. Use the distributive property to simplify.<br> -7( y + 9) - (y + 4)<br> I
Oduvanchick [21]

Answer:

-8y-67

Step-by-step explanation:

-7(y+9)-(y+4) distribute

-7y-63-y-4 combine like terms

-8y-67

i believe this is the right answer :D

4 0
3 years ago
Can you guys please help me? Thanks!
olga2289 [7]
you are correct, it is one to two
4 0
3 years ago
How do you work out the 10th term?
poizon [28]

Answer:

I believe that you multiply 5 x 10 because you multiply any of the terms by 5.

Step-by-step explanation:

Like another example is the 41st term which is 5 × 41 = 205

3 0
3 years ago
Read 2 more answers
Assume that the random variable X is normally distributed, with mean 60 and standard deviation 16. Compute the probability P(X &
elixir [45]

Answer:

P(X < 80) = 0.89435.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

\mu = 60, \sigma = 16

P(X < 80)

This is the pvalue of Z when X = 80. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{80 - 60}{16}

Z = 1.25

Z = 1.25 has a pvalue of 0.89435.

So

P(X < 80) = 0.89435.

5 0
3 years ago
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