Answer:Andrew tarda 19 minutos en ducharse y desayunar
Explicación paso a paso:
720 seg de ducharse + 420 segundos de su desayuno dan igual a 1140 segudnos
a este numero de segundos hay que pasarlo a minutos. El resultado es 19 minutos que son 1140 segundos
Step-by-step explanation:
Proportional and linear functions are almost identical in form. The only difference is the addition of the “b” constant to the linear function. Indeed, a proportional relationship is just a linear relationship where b = 0, or to put it another way, where the line passes through the origin (0,0).
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Answer:

Step-by-step explanation:
The sum of an infinite geometric series is expressed according to the formula;
where;
a is the first term of the series
r is the common ratio
If the sum of an infinite geometric series is three times the first term, this is expressed as 
Substitute
into the formula above to get the common ratio r;


open the parenthesis

subtract 3 from both sides

<em>Hence the common ratio of this series is </em>
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