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Tamiku [17]
3 years ago
8

A família Oliveira consiste no pai, na mãe e em alguns filhos. A idade média da família é de 18 anos. Sem contar com o pai, que

tem 38 anos, a idade média familiar diminui para 14 anos. Quantos filhos tem a família Oliveira? a) 2 b) 3 c) 4 d) 5 e) 6
Mathematics
1 answer:
Vladimir79 [104]3 years ago
3 0

Answer: e) 6

Step-by-step explanation:

Let x be mother + children = 18

Father's age = 38

Average age of the family = 14

38 + 18x /( x + 1 )= 14

Opening the bracket

38 + 18x = 14x + 14

Collecting like terms

24 = 4x

x = 6

no of children in the family is 6.

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2n-n-4+7n in simplest form
MrMuchimi
<span>2n-n-4+7n in simplest form is found by combining like terms:

(2-1+7)n - 4 = 8n-4, or 4(2n-1)</span>
6 0
3 years ago
I need help with 5! Please and thank you!!
11111nata11111 [884]

Answer:

116.87

Step-by-step explanation:

c=

c = \pi \:  \: r = 2 \times \pi \times 18.6 = 116.87

6 0
3 years ago
20k + 5 = 5k + 65 know the answer
Katyanochek1 [597]

Solving for 'k'

20k + 5 = 5k + 65

20k = 5k + 65 -5

20k = 5k + 60

20k - 5k = 60

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15k/15 = 60/15

k = 4

4 0
3 years ago
Read 2 more answers
Start of Questions The admission fee at an amusement park is $5.00 for children and $6.00 for adults. On a certain day, 314 peop
Greeley [361]

Answer:

144 children and 170 adults

Step-by-step explanation:

make 2 equations

make :

the children as the regarded as the variable : x

the adults are the regarded as the variable  : y

<em>5x + 6 y = 1740</em>

<em>x + y = 314</em>

<h3><u>solve this by the method of elimination </u></h3>

5x + 6y = 1740

5(x + y = 314)

= 5x + 5y = 1570

5x + 6y = 1740

5x + 5y = 1570

the 5x is cancelled out

6y - 5y = 1740 - 1570

y = 170

now replace the value of y in the eqaution

5x + 6 (170) = 1740

5x =720

x = 144

hence they were 144 children and 170 adults

mark as brainiest

3 0
3 years ago
Read 2 more answers
What is 4/6/10 plus 6/10 fractions
Paul [167]

Answer:

5 and 1/5

Step-by-step explanation:

it is written like this 4 and 6/10 + 6/10

so its 4 and (6+6) 12/10


12-10= 2 = 1 and 1/5

4 +1= 5

so now you have 5 and 1/5


YaYYYY hun xD

7 0
3 years ago
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