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ehidna [41]
2 years ago
10

5:2 ratio. The total number of students and teachers was 56. How many students and teachers were there

Mathematics
1 answer:
Anna [14]2 years ago
5 0

Answer:

12. 5

11.

10

10

15. 7

14. 11

2

=

16

16

18. 3

+

11

17

3

4

'

co

loo

8

Step-by-step explanation:

12. 5

11.

10

10

15. 7

14. 11

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Mariam went to a shop and bought 8 snickers, 3 galaxy and 3 kitkat. She payed 8 BD
KiRa [710]

Answer:

Yes

Step-by-step explanation:

Let s be the price of snickers, g the price of galaxy and k the price of kitkat.

●For Mariam the equation will be:

8 s + 3 g + 3k = 8

●For Zainab the equation will be:

4 s + 9 g + 4 k = 10.9

Take the first equation and divide both sides by 4 to make it easier.

You get:

● 2s + 0.75 g + 0.75k = 2

Take the second equation and divide both sides by 2 to make easier.

You get:

● 2s + 4.5g + 2k = 5.45

The new system of equation is:

● 2s +0.75g + 0.75k = 2

● 2s + 4.5g + 2k = 5.45

Express s in the first equation using the other variables.

● 2s +0.75g +0.75k = 2

● 2s + 0.75(g+k) = 2

● 2s = 2-0.75(g+k)

● s = 1- 0.325 (g+k)

Replace s by the new expression in the second equation:

●2 [1-0.325(g+k)] +4.5 g +2k = 5.45

●2-0.75(g+k) +4.5g + 2k = 5.45

●2- 0.75g -0.75k +4.5 g +2k = 5.45

●2+ 3.75g + 1.25k = 5.45

● 3.75g +1.25k = 3.45

We have eliminated one variable (s)

We will keep (3.75g+1.25k=3.45) and use it.

Now that we eliminated in the second equation do it again in the first one.

You will get a system of equations with two variables.

Solve it and replace g and k with the solutions.

Finally solve the equation and find s.

8 0
3 years ago
Sarabeth is selling bracelets as a fundraiser for the school library. Each bracelet with blue beads sells for $4. 50. Each brace
bixtya [17]

Linear equation is the equation in which the power of the unknown variable is 1. The number of bracelet with blue beads is 10 and bracelet with red beads is 17

Given information-

Each bracelet with blue beads sells for $4. 50.

Each bracelet with red beads sells for $5.

Sarabeth raised a total of $130 for the library.

<h3>Linear equation</h3>

Linear equation is the equation in which the power of the unknown variable is 1

The number of bracelet with blue beads is b and the number of bracelet with red beads is r.

As the number of bracelets with red beads (r) that Sarabeth sold is 3 less than twice the number of bracelets with blue beads (b) sold. Thus,

r=2b-3

Each bracelet with blue beads sells for $4. 50 and each bracelet with red beads sells for $5. Sarabeth raised a total of $130 for the library. Thus

130=4.5b+5r

Put the value of r in the above equation,

\begin{aligned}130 &=4.5b+5(2b-3)\\130 &=4.5b +10b-15\\130+15 &=14.5b\\b&=\dfrac{145}{14.5} \\b&=10\\\end

Therefore the number of blue bracelet are 10. Thus the red bracelets are,

r=2\times10-3

r=17

Hence the number of bracelet with blue beads is 10 and bracelet with red beads is 17.

Learn more about the linear equation here;

brainly.com/question/11897796

5 0
2 years ago
Twice jacks age plus five is 21. Write and solve an equation. How old is jack
Vera_Pavlovna [14]

Answer:

Jack is 8

Step-by-step explanation:

j= jacks age

2j+5 =21

This is the equation from Twice jacks age plus five is 21

We want to isolate j

Subtract 5 from each side

2j+5 =21

2j+5-5 = 21-5

2j = 16

Divide by 2

2j/2 =16/2

j =8

8 0
4 years ago
Read 2 more answers
Answer the given questions please!
irinina [24]
The absolute value of |-7.9| is 7.9
|8.5| = 8.5
B 5 and D -5 have absolute values of 5
|-5.6| = 5.6
8 0
2 years ago
Prove that 3^17−3^15+3^13 is divisible by 73.<br><br> HELPPPPPP PLEASEEE
Fiesta28 [93]

Answer:

Well 3^17-3^15+3^13 equals 116,385,579

Now divide that by 73

So 116,385,579 ÷ 73

That equals 1,594,323

Hope this helps

4 0
3 years ago
Read 2 more answers
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