1. Resolva as seguintes equações do 1o grau: a) 5x + x – 40 = 5 – x
b) 20 + 6x = -2x + 26
c) 3,5x + 1 = 3 + 3,1x
d) 7p + 15 – 5p 10 = - 17 + 13p
e) 13y – 5 = 11 + 9y
f) 9t – 14 = 7t + 20
g) 5 – a – 11 = 4a – 22
h) 2y + 21 – 6y = - 12 + y – 7

POR FAVOR COM CANTAS...!

Roger could feed 5 walruses with 4 kilograms of fish. how many walruses could he feed with 7.2 kilograms of fish?

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above

Which number produces an irrational number multiplied by 1/3