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svp [43]
3 years ago
11

Evaluate the expression if s=3 and t=6 3s+t 15 21 27 39

Mathematics
2 answers:
Brut [27]3 years ago
5 0

Answer:

15

Step-by-step explanation:

Substitute s = 3 and t = 6 into the expression

3s + t

= (3 × 3) + 6 = 9 + 6 = 15

Serhud [2]3 years ago
5 0

Answer:

the answer is 15

Step-by-step explanation:

3 x 3= 9

9 + 6= 15

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A preliminary sample of holiday shoppers revealed that the standard deviation of the amount of money they are planning to spend
Andru [333]

Answer:

n=(\frac{2.58(80)}{7})^2 =869.407 \approx 870

So the answer for this case would be n=870 rounded up to the nearest integer

Step-by-step explanation:

Information given

\sigma = 80 represent the deviation

ME = 7 represent the margin of error

Solution

The margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =7 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

The critical value for 99% of confidence interval now can be founded using the normal distribution. The significance level would be \alpha=0.01 and \alpha/2 =0.05. The critical value would be z_{\alpha/2}=2.58, replacing into formula (b) we got:

n=(\frac{2.58(80)}{7})^2 =869.407 \approx 870

So the answer for this case would be n=870 rounded up to the nearest integer

7 0
3 years ago
the length of a rectangle is three times it’s width. if the area of the rectangle is 300 yd^2, find its perimeter.
Mashutka [201]

Answer:

80 yards

Step-by-step explanation:

Using the area formula, A = lw, set up an equation where w represents the width.

The length can be represented by 3w because it is 3 times the width:

A = lw

300 = (3w)(w)

300 = 3w²

Solve for w:

300 = 3w²

100 = w²

10 = w

So, the width is 10 yards.

The length will be 30 yards since the length is 3 times the width.

Then, add the lengths and widths together to find the perimeter:

10 + 10 + 30 + 30

= 80

So, the perimeter is 80 yards

6 0
4 years ago
Please help last 4 questions to solve and can figure them out
OLga [1]

Answer:

3. Option D

5. Option B

13. Option D

17. Option B

Step-by-step explanation:

<u>Question 3</u>

4C means that, multiply 4 with  all the terms in the matrix A . We get option D.

<u>Question 5</u>

Matrix A + matrix B  means that add corresponding terms of each matrix.

We get option B.

<u>Question 13</u>

Here we have to find a₁,₂ (the term in which first row second column)

a₁,₂ = 2

We get option D.

<u>Question 17</u>

B - CF - First multiply matrix C with matrix F and subtract it from Matrix B.

We get option B

5 0
3 years ago
Three fourths of the fans did not carry banners of 1000 fans attended game how many fans carried banners
zimovet [89]

Answer:

250

Step-by-step explanation:

1000 divide by 4 is 250

1 times

250=250

6 0
3 years ago
Help with math problem. Fractions
vladimir1956 [14]

Answer:

21+4=25

Step-by-step explanation:

8 0
3 years ago
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