All categories

3 years ago

The sum of two numbers is 13, the difference is 4. What are the numbers?

Mathematics

2 answers:

marshall27 [118]3 years ago

7 0

Answer: $\frac{17}{2}and \frac{9}{2}$ or 8.5 and 4.5

Step-by-step explanation:

SSSSS [86.1K]3 years ago

3 0

Answer:

8.5, 4.5

Step-by-step explanation:

You might be interested in

A dozen tomatoes cost 1.56. how many does one tomatoes cost

Gelneren [198K]

You divide 12 by 1.56 because a dozen is 12 of something. This gives you about 8 cents per

7 0

3 years ago

Read 2 more answers

Data were collected on random specimens of Yellowfin tuna from 1991 and 2010. For the sample of 231 specimens of Yellowfin tuna,

Molodets [167]

Answer:

95% confidence interval: (0.325 ,0.383)

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 231

Sample mean = 0.354 ppm

Sample standard deviation = 0.231 ppm

95% confidence interval:

$\bar{x} \pm t_{critical}\displaystyle\frac{s}{\sqrt{n}}$

Putting the values, we get,

$t_{critical}\text{ at degree of freedom 4 and}~\alpha_{0.01} = \pm 1.97$

$0.354 \pm 1.97(\dfrac{0.231}{\sqrt{231}} ) = 0.354 \pm 0.029 = (0.325 ,0.383)$

6 0

3 years ago

1.<br> Use trigonometry to work out the value of x.<br> Not drawn accurately. <br> Help pls

tino4ka555 [31]

Answer:

20cos(39) or 15.543 (3 d.p.)

Step-by-step explanation:

Use SOHCAHTOA
You want to find A and have an angle of 36° and H
So use CAH
cos(39) = x / 20
x = 20cos(39)

8 0

2 years ago

If BI=9 and HA=15, find the scale factor

inessss [21]

Answer:

5:3

Step-by-step explanation:

to find the scale factor you set up the proportion as 15/9 and reduce to 5/3

7 0

3 years ago

Multiply 2/3 by 42, and then multiply that product by 10

Mrac [35]

Answer:

140 is the answer

Step-by-step explanation:

2/3 of 42 is 14 multiplied by ten is 140

Hope this helps ;)

7 0

3 years ago