Question

Escreva uma expressao algébrica para
a) Um numero mais 3 menos seu dobro
b) Um numero menos 10 mais seu quintuplo

Answer 1

Resposta:

Every time the phrase mentions "a number", we will translate it into mathematical language like x and perform the requested calculations on each item.

1. a) A number plus twelve units. → x + 12

b) The quintuple of a number minus seven units. → 5x - 7

c) Nine units minus one third of a number. → 9 - x / 3

d) A number minus three units. → x - 3

e) Five units plus double a number. → 5 + 2x

f) Half a number plus ten units. → x / 2 + 10.

2. The tariff is given by the fixed part plus the variable part multiplied by R $ 2.75.

a) P = 4.5 + 2.75x

b) P = 4.5 + 2.75.10

P = 4.5 + 27.5

P = 32 reais

c) P = 4.5 + 2.75.20

P = 4.5 + 55

P = 59.50 reais.

3.a) A number plus twelve units is equal to 30. → x + 12 = 30

b) The quintuple of a number minus 7 units is equal to 13. → 5x - 7 = 13

c) Mathematically incorrect phrase, look for your teacher.

d) A number minus three units is equal to four times that number plus seven units. → x - 3 = 4x + 7

e) Five units plus double a number is equal to twenty-three units. → 5 + 2x = 23

Learn more at:

brainly.com.br/task/33208652

Explicação passo-a-passo: