All categories

3 years ago

Find two numbers with a sum of 15 and a difference of 4

Mathematics

2 answers:

Snezhnost [94]3 years ago

8 0

Answer:

Step-by-step explanation:

X+Y=15

X-Y= 4

=> X-Y+2Y=15

<=> 4+2Y= 15

=> Y= 5,5

=>X = 15-5,5=9,5

Vậy 2 số đó là 9,5 và 5,5

lys-0071 [83]3 years ago

6 0

Answer:

The numbers are

5.5 and 9.5,

Step-by-step explanation:

If the numbers are x and y:

x + y = 15

x - y = 4

If we add these 2 equations we eliminate y, so

2x = 19

x = 19/2 = 9.5.

Substituting in the first equation for x:

9. 5 + y = 15

y = 15 - 9.5 = 5.5

You might be interested in

guys.. my crush just asked to call but i’m insecure about my voice. what should i do:(

sasho [114]

Be yourself, think about it your crush is about to call you , you got this

6 0

2 years ago

2. In a given population of two-earner male-female couples, male earnings have a mean of $40,000 per year and a standard deviati

Kobotan [32]

Answer: $85,000

Step-by-step explanation:

Given : In a given population of two-earner male-female couples, male earnings have a mean of $40,000 per year and a standard deviation of $12,000.

$\mu_M=40,000\ \ ;\sigma_M=12,000$

Female earnings have a mean of $45,000 per year and a standard deviation of $18,000.

$\mu_F=45,000\ \ ;\sigma_F=18,000$

If C denote the combined earnings for a randomly selected couple.

Then, the mean of C will be :-

$\mu_c=\mu_M+\mu_F\\\\=40,000+45,000=85,000$

Hence, the mean of C = $85,000

8 0

3 years ago

I need #8 done (Show work) will mark brainliest

Fittoniya [83]

Answer:

see explanation

Step-by-step explanation:

Since BD bisects ∠ ABC , then

∠ ABD = ∠ DBC , substitute values

3x + 4 = 55 ( subtract 4 from both sides )

3x = 51 ( divide both sides by 3 )

x = 17

3 0

2 years ago

Read 2 more answers

How do you put these in order from least to greatest? 13%, 1/3, 0.35, 0.25?

labwork [276]

13% 0.25 1/3 0.35 least to greatest

3 0

3 years ago

I need help with this question. Can you please help me. I’ll give you 18 points if it’s correct

lukranit [14]

Answer:

34.4

Step-by-step explanation:

Using Triangle Sum Theory, you see that the triangles are similar. They have the same angle measurements. That means their corresponding sides are proportional.

$\frac{MN}{NO}$ = $\frac{PQ}{QR}$