3 years ago

Which of the following doesn't belong? 20-6-15-18-4

Mathematics

2 answers:

laila [671]3 years ago

5 0

The answer would be 15 because all of them are even

Charra [1.4K]3 years ago

3 0

Answer: 15.

Step-by-step explanation: 15 is the only off number in the sequence, the rest are all even.

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Calculator display for 7/12

Alina [70]

Answer:

7/12=0.583333333333

Step-by-step explanation:

7 0

3 years ago

The function y = x * ln(x + e) has two distinct x intercepts. One is at x = a and the other is at x = b. The value of a + b is

Snezhnost [94]

As points, x-intercepts take the form $(x,0)$ , so to find the intercepts we can set $y=0$ and solve for $x$ .

$x\ln(x+e)=0\implies\begin{cases}x=0\\\ln(x+e)=0\end{cases}$

From the first equation alone, we already know that $x=0$ is a solution, which means one intercept is $(0,0)$ .

The second equation gives

$\ln(x+e)=0\implies e^{\ln(x+e)}=e^0\implies x+e=1\implies x=1-e$

so that the second intercept occurs at $(1-e,0)$ .

So if $a=0$ and $b=1-e$ , we have $a+b=1-e$ , giving C as the answer.