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BabaBlast [244]
3 years ago
12

180=2x+y which equation is used to find x

Mathematics
1 answer:
Serggg [28]3 years ago
3 0
180=2x+y
180-y=2x
(180-y)/2=x
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Question in the picture ​
NNADVOKAT [17]

Answer:

70 degrees

Step-by-step explanation:

corresponding angle of a triangle

5 0
3 years ago
If every gram of salt is 20.9% chlorine, how much is required to make a 220 ppm chlorine solution with 350 grams of water?
Temka [501]

Answer:

The amount of salt required is 0.3685 grams.

Step-by-step explanation:

20.9% of 1 gram of salt is chlorine, which means the grams of chlorine in 1 gram of salt are

\dfrac{20.9\%}{100\%} *1\: gram = 0.209g\: \text{chlorine}

Now, to make 220 ppm solution, it must be that

\dfrac{220}{10^6} = \dfrac{y}{350+y},

where y is the grams of chlorine required.

We rearrange the equation and solve for y:

220(350+y) = 10^6y

77000+220y =10^6y

77000 = (10^6-220)y

y = \dfrac{77000}{999780}

\boxed{y= 0.07702g}

since 1 gram of salt has 0.209 grams of chlorine, 0.07702g of chlorine corresponds to

\dfrac{0.07701}{0.209} = 0.3685g {\text{ of salt. }

Thus the amount of salt required is 0.3685 grams.

7 0
3 years ago
At a school there are five lessons in a day in total the five lessons last 4 hours assume that each session lasts the same amoun
ikadub [295]

Answer:

48 minutes long

Step-by-step explanation:

For a total amount of minutes the lessons are, take 4x60. 4 for the total time in the lessons and 60 for 60 minutes in an hour. 4x60= 240 minutes.

Take 240/5. 240 is the total number of minutes and with the five lessons being the same amount of time, you divide the total number of minutes by the number of lessons. 240/5= 48 minutes

7 0
2 years ago
How much is a one time investment of 250 be when invested at 6% for 40 years in compound annually
vova2212 [387]

Hi

6% increase is multiply by 1,06

done 40 times

so : 250* 1,06^40 = 2571 ,

7 0
2 years ago
Which number is not a solution to the inequality below? x<15 A -6 B -2 C 11 D 17 Please help! Thanks
Svetach [21]

Answer:

D.17

Step-by-step explanation:

We are given that inequality

x<15

We have to find the number which is not a solution of the given inequality.

x<15

It means the values of x which is less than 15.

A.-6

-6<15

Therefore, it is the solution of given inequality.

B.-2

-2<15

Therefore, it is the solution of given inequality.

C.11

11<15

Therefore, it is the solution of given inequality.

D.17

17>15

Therefore, it is not a solution of given inequality.

Option D is true.

6 0
3 years ago
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