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olchik [2.2K]
3 years ago
7

Bob had 51 baseball cards. He gave away 17 baseball cards. How many baseball cards, c, does Bob have left? Choose the answer tha

t represents the correct equation and solution.

Mathematics
2 answers:
murzikaleks [220]3 years ago
6 0

total number of baseball cards left with Bob are 34.

Mrac [35]3 years ago
4 0

Answer:

Step-by-step explanation:

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Hi can someone help me by explaining how to do inverse operations? I need the operations for base and lenght
taurus [48]

Answer:

inverse operations (KristaKingMath)

7 0
3 years ago
3^2 ÷ 3^-1 explain the steps
Ksenya-84 [330]
First you would need to Simplify <span>{3}^{2}<span>3<span>​2​​</span></span></span> to <span>99

Next you would need to : </span>Use Negative Power Rule​​ =​9÷​3​​1​​
<span>
then you would need to use a ÷ b/c = a * c/b and get 9*3

And you will lastly get 27</span>
7 0
3 years ago
Some transportation experts claim that it is the variability of speeds, rather than the level of speeds, that is a critical fact
scZoUnD [109]

Answer:

Explained below.

Step-by-step explanation:

The claim made by an expert is that driving conditions are dangerous if the variance of speeds exceeds 75 (mph)².

(1)

The hypothesis for both the test can be defined as:

<em>H</em>₀: The variance of speeds does not exceeds 75 (mph)², i.e. <em>σ</em>² ≤ 75.

<em>Hₐ</em>: The variance of speeds exceeds 75 (mph)², i.e. <em>σ</em>² > 75.

(2)

A Chi-square test will be used to perform the test.

The significance level of the test is, <em>α</em> = 0.05.

The degrees of freedom of the test is,

df = n - 1 = 55 - 1 = 54

Compute the critical value as follows:

\chi^{2}_{\alpha, (n-1)}=\chi^{2}_{0.05, 54}=72.153

Decision rule:

If the test statistic value is more than the critical value then the null hypothesis will be rejected and vice-versa.

(3)

Compute the test statistic as follows:

\chi^{2}=\frac{(n-1)\times s^{2}}{\sigma^{2}}

    =\frac{(55-1)\times 94.7}{75}\\\\=68.184

The test statistic value is, 68.184.

Decision:

cal.\chi^{2}=68.184

The null hypothesis will not be rejected at 5% level of significance.

Conclusion:

The variance of speeds does not exceeds 75 (mph)². Thus, concluding that driving conditions are not dangerous on this highway.

7 0
3 years ago
Marilyn purchased a book that had a regular price of $19. She used a coupon that reduced the regular price by 15%. Sales tax for
Alika [10]

Answer:

2.80

Step-by-step explanation:

The discount is the regular price times the discount

discount = 19 *15%

discount = 2.85

The new price is the regular price minus the discount

new price = 19-2.85

                 =16.15

Now she has to pay the sales tax

tax = new price * tax rate

tax= 16.15 * 6.5%

     = 16.15 *.065

       =1.05

We add the tax to the new price to get the final price

final price = new price+tax

                = 16.15 +1.05

                =17.20

She pays with a 20 dollar bill

Change = payment - final price

              =20.00 - 17.20

              = 2.80

4 0
3 years ago
From the information​ given, what is the biggest flaw in the​ study? A health researcher randomly selected 500 high school stude
Black_prince [1.1K]

Answer:

The correct answer is - The setting may discourage honest responses.

Step-by-step explanation:

In this particular setting of research and interview regarding this research may not produce hones results as the question is too direct to ask students if they had ever used drugs.

Research should be anonymous and should avoid the questions that can lead to bias results like this case that may lead to dishonest results.

Thus, the correct answer is : The setting may discourage honest responses.

5 0
3 years ago
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