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Lubov Fominskaja [6]
3 years ago
15

Solve for b.7b - 15 = 5b - 3​

Mathematics
1 answer:
guapka [62]3 years ago
7 0

Answer: b=6

Step-by-step explanation: subtract 5b from both side and get 2b-15=-3 then add 15 on both side to get 2b=12 then divide 2 on both side and get b=6.

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After a 40% discount, the cost of a sofa is $471.00. What was the original cost of the sofa? NEED HELP ASAP
statuscvo [17]

Answer: $659.40

Step-by-step explanation: You start with 471.00 X 0.4 which equals $188.40. So then you add $471.00 and $188.40 and you get $659.40!

5 0
2 years ago
A researcher is planning to compare the effects of two different types of lights on the growth of bean plants. She expects that
kicyunya [14]

Answer:

The sample size is  n  = 36

Step-by-step explanation:

From the question we are told that

   The sample standard deviation is  s =  1.5

  The mean difference of the two groups is  \=x _ 1 - \=x_2 =  1

   The standard error is  SE =  \frac{ \= x_1 - \= x_2}{4}

=>                                      SE =  \frac{1}{4}

Let assume that the confidence level is 95% hence the level of significance is  

   \alpha = (100-95)\%

=> \alpha = 0.05

So the critical value of  \frac{\alpha }{2} obtained from the normal distribution table is

     Z_{\frac{\alpha }{2} } = 1.96

Generally the margin of error is mathematically evaluated as

     E =  Z_{\frac{\alpha }{2} } * SE    

   E =  1.96 * \frac{1}{4}

    E = 0.49

Generally the sample size is mathematically represented as

  n =[ \frac{Z_{\frac{\alpha }{2}  * s^2}}{E}]^2

=> n  = [\frac{1.96 * 1.5}{0.49} ]^2

=> n  = 36

6 0
3 years ago
In a science experiment,the temperature decreased by 0.1 degree Celsius every 15 minutes. Find the unit rate
maksim [4K]
0.1  decrease in 15 minutes 
unit rate is   0.1 / 15  = 0.00667
Temperature is decreasing by 0.00667 degrees Celsius per minute
8 0
2 years ago
#6 math help fun please?
julsineya [31]

Answer:

mean: 27.6

median: 32

mode: 35

range: 35

Step-by-step explanation:

Definitions:

mean: average

median: middle

mode: the number that comes up the most

range: the difference between the highest and lowest values/numbers

What to do:

mean: you add up all the numbers and then you divide that sum by the amount of numbers there are (I'm not going to do the work because that's a lot of numbers to type out, but you can check your work with my answer).

~answer is 27.6

median: middle number --> 32

mode: the number that comes up the most --> 35

range: 40-5 = 35

4 0
3 years ago
Which clipboard (A, B, or C) represents a 270 degree counter- clockwise rotation?
nignag [31]

Answer: C

Step-by-step explanation:

Because if you look at the star then it will show you how it rotated.

5 0
3 years ago
Read 2 more answers
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