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allochka39001 [22]
2 years ago
9

Simplify-2(y+4) + 3y

Mathematics
2 answers:
Pie2 years ago
8 0

Answer: y-8

Step-by-step explanation:

elena55 [62]2 years ago
4 0

Answer:

<h2><u><em>y - 8</em></u></h2>

Explanation:

−2(y + 4) + 3y

  • Distribute

(−2)(y) + (−2)(4) + 3y

= −2y + −8 + 3y

  • Combine Like Terms

−2y + −8 + 3y

= (−2y + 3y) + (−8)

= y + −8

  • Simplify
<h2><u><em>y - 8</em></u></h2>
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During a test period, an experimental group of 10 vehicles using an 85 percent ethanol-gasoline mixture showed mean CO2 emission
Zinaida [17]

Answer:

-1.683

Step-by-step explanation:

Given :

Group 1 :

x1 = 667 ; n1 = 10 ; s1 = 20

Group 2 :

x2 = 679 ; n2 = 14 ; s2 = 15

The test statistic assuming equal variance :

x1 - x2 / √[Sp² * (1/n1 + 1/n2)]

sp² = [(n1 - 1)*s1² + (n2 - 1)*s2²] ÷ (n1 + n2 - 2)

Sp² = [(10 - 1)*20² + (14 - 1)*15²] = 296.59

Test statistic =

(667 - 679)/ √[296.59 * (1/10 + 1/14)]

-12 / 7.1304978

Test statistic = - 1.682

8 0
2 years ago
numerele a, b si c sunt direct proportionale cu 2, 3 si 5. Daca media aritmetica a celor trei numere este egala cu 100, determin
Fynjy0 [20]

Answer:

a = 60

b = 90

c = 150

Step-by-step explanation:

Numerele a, b și c sunt direct proporționale cu 2, 3 și 5.

Unde k este constantă de proporționalitate

a ∝ 2

a = 2k

b ∝ 3

b = 3k

c ∝ 5

c = 5k

Dacă media aritmetică a celor trei numere este egală cu 100, determinați numerele a, b și c

= 2k + 3k + 5k / 3 = 100

= 10k / 3 = 100

Cross Multiply

= 10k = 3 × 100

= 10k = 300

Împărțiți ambele părți la 10

k = 300/10

k = 30

Pentru numărul a

a = 2k

a = 2 × 30

a = 60

Pentru numărul b

b = 3k

b = 3 × 30

b = 90

Pentru numărul c

c = 5k

c = 5 × 30

c = 150

Prin urmare, a = 60, b = 90, c = 150

3 0
3 years ago
fiona is heating water for a science experiment.the temperature of the water increases 4/5 of a degree every 2/5 of a minute.how
Scilla [17]

Answer:

4/5:2/5 = ratio of degrees to time

2/5*2.5 = 1 min

4/5*2.5 = 10/5 = 2

2 degrees every min

Step-by-step explanation:

3 0
2 years ago
What does it mean if i say that there is a 25% chance there will rain tomorrow?
77julia77 [94]
It is not likely because it is less then 50% which 50 is half and 25% is 1/4 chance.
7 0
3 years ago
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(9 + 11) divided by (5 + 4 + 1) (9 + 11) write 3 steps then put the answer and i will give u brainliest!
Rufina [12.5K]

Answer:

(9 + 11) /(5 + 4 + 1)(9 + 11)

20/10(20)

20/200

1/10

4 0
2 years ago
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