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4 years ago

Your test grades are 70. 85. 95. 93 and 94. You have one more test and want an average of an 86. What must

Mathematics

1 answer:

insens350 [35]4 years ago

7 0

Answer:

Step-by-step explanation:

Let last test score be y

Average = sum of test scores/ number of test scores.

Average was given in question = 86

86= 70+85+95+93+94+y/6

86= 437+y/6

Cross multiply

86*6 =437+y

516= 437+y

Collect like terms

516-437=y

Y=79

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Classify each polynomial according to its degree and type. Look at the screenshot below!

Ahat [919]

Answer:

Monomial Binominal Trimoninal

Degree 1: -9x x + 6

Degree 2: -4 $x^{2}$ $4x^{2} -x$ $x -3x^{2} + 1$

Degree 3: 4 $x^{3}$ 5 - 2 $x^{3}$ $3x^{2} + 3x^{3} -10$

Step-by-step explanation:

I do not know how to explain how I got to this answer, but here is the answer.

8 0

2 years ago

Find the next two terms in the given sequence, then write it in recursive form. A.) {7,12,17,22,27,...} B.) { 3,7,15,31,63,...}

iren [92.7K]

Answer:

A) a_n = 5n + 2

B) a_n = (2^(n + 1)) - 1

Step-by-step explanation:

A) The sequence is given as;

{7,12,17,22,27,...}

The differences are:

5,5,5,5.

This is an arithmetic sequence following the formula;

a_n = a_1 + (n - 1)d

d is 5

Thus;

a_n = a_1 + (n - 1)5

Now, a_1 = 7. Thus;

a_n = 7 + 5n - 5

a_n = 5n + 2

B) The sequence is given as;

{ 3,7,15,31,63,...}

Now, let's write out the differences of this sequence:

Differences are:

4, 8, 16, 32

This shows that it is a geometric sequence with a common ratio of 2.

In the given sequence, a_1 = 3 and a_2 = 7 and a_3 = 15

Thus, a_2 = 2a_1 + 1

Also, a_(2 + 1) = 2a_2 + 1

Combining both equations, we can deduce that: a_(n + 1) = 2a_n + 1

Thus; a_n can be expressed as:

a_n = (2^(n + 1)) - 1

7 0

4 years ago

Idk wat to do.....<br>........

oksano4ka [1.4K]

Answer:

Mean : 95

Median : 85

Mode : 90

Part B : Impossible

Step-by-step explanation:

We can make an equation to find the mean using the first 5 history test scores.

$85=\frac{80+75+90+75+95+n}{6} \\ \\ 85=\frac{415+n}{6} \\ \\ 510=415+n \\ \\ n=95$

So a 95 would be needed to have a mean of 85.

Next, the median.

First, we sort the first 5 history scores from least to greatest.

We get 75, 75, 80, 90, 95.

Since, 80 is the middle value, it will be used in the calculation of the median.

We can make an equation with this.

$82.5=\frac{80+n}{2} \\ \\ 165=80+n \\ \\ n=85$

So a score a 85 would be needed to have a median of 82.5

Thirdly, the mode.

Since 90 is already in the set once, we can just have Maliah score another 90 to make 90 the mode (with the exception of 75 of course).

Finally, Part B.

We can use the equation we had for the first mean calculation but change 85 to 90.

$90=\frac{80+75+90+75+95+n}{6} \\ \\ 90=\frac{415+n}{6} \\ \\ 540=415+n \\ \\ n=125$

So Maliah would need a score of 125 to make her mean score 90, but since the range is only from 0-100, it is impossible.

8 0

4 years ago

Which term in the quotient of this expression contains an error?

VikaD [51]

Answer:

Criedts to this person: cwrw238

Step-by-step explanation:

The + 78 :- it should be + 60.

Step-by-step explanation:

Long division:-

x - 3 )4x^4 - 6x^3 + 0x^2 + 6x + 3 ( 4x^3 + 6x^2 + 18x + 60 <--- Quotient.

4x^4 - 12x^3

6x^3 + 0x^2

6x^2 - 18x^2

18x^2 + 6x

18x^2 - 54x

60x + 3

60x - 180

183

7 0

3 years ago

5000 rounded to the nearest 10 thousand

Serga [27]

It only thousand you can't rounded to ten thousand

6 0

3 years ago