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viktelen [127]
3 years ago
10

Marla did 65 sit-up each day for one week. Use dostributive to solve

Mathematics
1 answer:
Inessa [10]3 years ago
6 0
7×65 7×(60+5)
(7×60) (7×5)
(420)+(35)
The answer is 455
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Uma função f é dada por f(x) = ax + b, em que a e b são números reais. Se f(–1) = 3 e f(1) = –1, determine o valor de f(3).
ale4655 [162]
F(x) = ax + b
Usa-se a informacao dada para criar um sistema de 2 equacoes com 2 variaveis. Resolve-se o sistema pare determinar os valores de a e b.Uma vez que se sabe os valores de a e b, escreve-se a funcao f com os valores de a e b. Finalmente calcucla-se f(3) usando a funcao f.


f(-1) = 3

a(-1) + b = 3

f(1) = -1

a(1) + b = -1

O sistema de equacoes e o seguinte.
Resolvemo-lo par adicao. 
A variavel a e eliminada.



-a + b = 3
a + b = -1

2b = 2

b = 1

a + 1 = -1

a = -2

Agora sabemos the a = -2 e b = 1.
Escrevemos a funcao f usando os valores the a e b calculados..



f(x) = -2x + 1

f(3) = -2(3) + 1 = -6 + 1 = -5

f(3) = -5
6 0
3 years ago
PLS SOLVE WILL MARK AS BRAINLIEST PLUS 5* VOTE, TROLLS WILL GET ALL THEIR ANSWERS AND QUESTIONS REPORTED​
SCORPION-xisa [38]

Answer:20

Step-by-step explanation:

5 0
3 years ago
Please answer correctly! I will mark you as Brainliest!
zheka24 [161]

Answer:

the height is 9.8 cm

Step-by-step explanation:

71.54 ÷ 7.3 = 9.8

6 0
3 years ago
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