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Snowcat [4.5K]
3 years ago
8

Emeka is thrice as old as Dora and Dora is

Mathematics
2 answers:
I am Lyosha [343]3 years ago
8 0

Answer:

Step-by-step explanation:

3(7+x)+7+x+x=38

21+3x+7+2x=38

28+5x=38

5x=38-28=10

D.b.s by 5

10÷5=2

ivanzaharov [21]3 years ago
4 0

Answer:

Step-by-step explanation:

let duke be x years

dora be 7+x years

and emeka be 3(7+x) years

according to question ur equation is

3(7+x)+7+x+x=38

21+3x+7+2x=38

28+5x=38

5x=38-28

x=10/5

x=2

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schepotkina [342]

Answer:

2,3, and 4

Step-by-step explanation:

7 0
3 years ago
HELP PLZ DUE RN BRAINIEST TO WHOEVER RIGHT
77julia77 [94]

A=1

B=-5

C=3

-(-5)+(Square root of) (-5)^2+4(1)(3)/2(1)

-(-5)-(Square rooy of) (-5)^2+4(1)(3)/2(1)

5.5414 or -.5414

5 0
3 years ago
PLEASE HELP ME! I DON'T UNDERSTAND THIS
Marrrta [24]
Answer: 
The system is composed of these two inequalities combined
y <= -x+4
y >= (1/3)x

-----------------------------------------------------------------------

Explanation:

The solid line has the boundary equation y = -x+4
This line goes through (0,4) and (4,0). Using the slope formula, we find that m = -1. Plugging m = -1 and (x,y) = (0,4) into y = mx+b leads to y = -x+4

The shading is below the solid line so we change the equal sign to a "less than or equal to" sign, which leads us to y <= -x+4

That takes care of the first inequality. We must use "or equal to" as part of the inequality to ensure the boundary is solid

------------

The second inequality is y > (1/3)x as the boundary line is y = (1/3)x. This line goes through (0,0) and (3,1). The slope is 1/3 and y intercept is 0

The boundary is a dashed line. This means we don't have "or equal to" as part of the inequality


7 0
3 years ago
Which expression would the model be most helpful in solving?
vovangra [49]

This question is awfully vague without any images of the equation to back it up, sorry

4 0
3 years ago
19/100+7/10 wich fraction can be used in place of 7/10 to find the value of the expression​
Dimas [21]

Answer:

70/100.

Step-by-step explanation:

When adding fractions, you need to find a common denominator.

This just means that the numbers at the bottom of both fractions you are adding must be the same.

So for 19/100 + 1/10, you need to match the two denominators (bottom numbers).

To do this, you need to multiply 10 by 10 to get 100.

What you do to the bottom, you must always do to the top as well.

So multiply 7 by 10 and get 70.

70/100 will replace 7/10.

Now you can add fractions because the bottom numbers are the same.

4 0
4 years ago
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