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VLD [36.1K]
3 years ago
7

How do you solve this??

Mathematics
1 answer:
gulaghasi [49]3 years ago
6 0
I can’t see the photo
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When 18 boys joined a group of why students, the ratio of boys to girls in the group became 4 : 5. Write an algebraic expression
expeople1 [14]
18 /(y + 18) = 4/9 <<<<===== answer. 
be careful the number of boys is in a ratio of the number of boys to the total.
Just to make sure I'm right, I solve it.
18 * 9 = 4*(y + 18)
162 = 4y + 72 Subtract  72 from both sides.
 90 = 4y Divide by 4
22.5 = y Never mind the 0.5. Does it work

18/22.5 = 0.8 
0.8 is the same thing as 4/5 
The problem makes no sense in the real world, but it does work out mathematically.
5 0
4 years ago
What is the distance, on a coordinate plane, between the points G(2.-3) and D(2, 4)?
Lady_Fox [76]

Answer:

Therefore ,the distance, on a coordinate plane, between the points G(2.-3) and D(2, 4) is GD = 7\ units

Step-by-step explanation:

Given:

point G( x₁ , y₁) ≡ ( 2 ,-3)  

point D( x₂ , y₂) ≡ (2 , 4)  

To Find:

Distance between GD=?

Solution:

Distance Formula between two point is given by

l(GD) = \sqrt{((x_{2}-x_{1})^{2}+(y_{2}-y_{1})^{2} )}

Substituting the values we get

l(GD) = \sqrt{((2-2)^{2}+(4-(-3))^{2} )}

l(GD) = \sqrt{((0)^{2}+(4+3))^{2} )}=\sqrt{49}=7\\l(GD)=7\ units

Therefore ,the distance, on a coordinate plane, between the points G(2.-3) and D(2, 4) is GD = 7\ units

8 0
3 years ago
If a circle’s diameter is 3 inches, what would be the best estimate of its circumference? A) 3 inches B) 9.42 inches C) 10.42 in
iogann1982 [59]
The answer would be approximately 9 inches but the real number is 9.42 So B is the answer. I hope this helped ^^
4 0
3 years ago
Read 2 more answers
What is the y intercept of the line with the equation y=2x+8
Mashcka [7]

Answer:

in the point slop form y=2x+8

the slope is 2

the y intercept is 8

6 0
3 years ago
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Liz has hiking a trail that is 0.8 miles long she traveled 2 tenths by herself the rest she travels with her friends how far doe
liubo4ka [24]
I think it she hikes 0.2 miles by herself.
5 0
3 years ago
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