Luiz Fernando elaborou um programa para sua calculadora científica. Digitando um numero N qualquer na entrada do programa, a calculadora efetua algumas operações e devolve na saída o numero R. No esquema abaixo, estão ilustrados os comandos que Luiz Fernando inseriu em seu programa . Entrada > (retângulo em branco) > (retângulo em branco) > Resultado

Soma 2 Eleva ao quadrado subtrai 4

a)Qual será o resultado de saída R quando Luiz Fernando digitar na entrada o numero N=6 ?

b)Luiz Fernando, depois de testar varios numeros ,reparou que ,ao digitar na entrada certo número N, o valor era igual ao triplo de N. Escreva a equação que descreve essa propriedade observada por Luiz Fernando.

c)Determine o número de entrada N que satisfaz a observação de Luiz Fernando.

dont understand

step-by-step explanation:

24

step-by-step explanation:

the graph shows 30% of students walk. 80 students were questioned, so the number that said they walk is

30% × 80 = 0.30 × 80 = 24

a) 40 more; b) old factory:   10%, new factory:   16%; c) week 4

explanation:

a) at week 0, we see in the graph that the new factory produces 190 specialty items.  

using the function, substituting 0 in for w,

this is a difference of 230-190 = 40.

b) the function for the old factory is written in the form f(x) = a(1+r)ˣ, where a is the original amount, x is the amount of time and r is the growth rate.   the equation for the old factory is ; 230 is in place of a and is the original amount; w is the amount of time; which means 1+r = 1.1.   this means that r must be 0.1 or 10%.

for the new factory, we find the percent of increase to find the growth rate; the formula for this is

between the first two points, the amount of change is 220-190 = 30; this gives us

30/190 = 0.158 ≈ 0.16 = 16%

c) at week 0, the old factory has 230 while the new factory has 190.

at week 1, the old factory has 230(1.1) = 253 while the new factory has 220.

at week 2, the old factory has 230(1.1²) = 278.3 while the new factory has 252.

at week 3, the old factory has 230(1.1³) = 306.13 while the new factory has 290.

at week 4, the old factory has 230(1.1⁴) = 336.743 while the new factory has 337.   this is the first week that the new factory surpasses the old.