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4 years ago

Find the two-digit number which is 2 times the sum of its digits. Find a statement and number, please.

2 answers:

5 0

A two-digit number is twice the sum of its digit. If the tens digit is 7 less than the unit digit, find the number.
Let x= the unit digit
Then y= the tens digit
And 10y+x= the number

x+y= the sum of the digits
Now we are told that 10y+x=2(x+y) ------1st equation 
We are also told that y=x-7 ----------- 2nd Equation 
So our equations to solve are: 
(1) 10y+x=2(x+y)
(2) y=x-7


Hope it helps

dusya [7]4 years ago

4 0

Answer:

2(x + y) = 10x + y

the number is 18

i hop this helps!

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Please do part A and part B on number 9!

Mashcka [7]

Answer:

A=5

B=4

Step-by-step explanatation

so the 3ft at the front and the 8ft at the back, you do 8-3 which is 5 which will be A and on the side, it is 8ft and since the corner angle is 4ft then B will be 8-4 which is 4

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3 years ago

1) A boat traveled 448 miles downstream and back. The trip downstream took 14 hours. The trip

Serhud [2]

Answer:B

I think we are in the same class lol

Step-by-step explanation:448 divided by 14= 32

448 divided by 16= 28

B=speed of boat in water

Y= Speed of current

B+y=32

B-y=28

32 + 28 =60

60 divided by 2 = 30

32 -30 =2

B=30

Y=2

Add my discord if you need more help Snapple#0141

6 0

3 years ago

7n + 5n2 + 10 – 7n Simplify the expression

Travka [436]

Answer:

10n+10

Step-by-step explanation:

7n-7n+5n2+10

5n2+10

5n*2+10

10n+10

Hope this helps :D

#Team Rainbows

7 0

3 years ago

Brady earns a base salary of $525 every week plus a 16% commission on his sales at a

Alex Ar [27]

Answer:

845

Step-by-step explanation:

$525 + (0.16 \times 2000)$

6 0

3 years ago

Read 2 more answers

What is the equation of the line that passes through (-3, -1) and has a slope of 2/5? Put your answer in slope-intercept form.

Zanzabum

Hi there!

The general formula of A line in slope-intercept form is the following:
$y = mx + n$

In this formula m represents the slope of the line. Therefore, we can conclude that m = 2/5.
$y = \frac{2}{5} x + n$

We also know that the line passes through the point (-3, -1) and we can therefore substitute this coordinate into the formula of the line.
x = -3 and y = -1

$- 1 = \frac{2}{5} \times - 3 + n$

Multiply first.
$- 1 = - 1\frac{1}{5} + n$

And finally add 1 1/5 to both sides of the equation.
$\frac{1}{5} = n$

We can now switch sides.
$n = \frac{1}{5}$

Now we've found our value of n, which we can substitute into the formula of our line. Hence, in slope-intercept form, we find the following:
$y = \frac{2}{5} x + \frac{1}{5}$

7 0

4 years ago