PLEASE HELP WITH THESE TWO MATH PROBS, ONLY ANSWER IF YOU KNOW!!

1 answer:

8 0

1. Divide.

(4.1 x 10^4) ÷ (1.28 x 10^-5)
=(4.1÷ 1.28) x 10^9
= 3.203 x 10^9
answer
C. 3.203 × 10^9

2. Add.

(4.9 x 10^1) + (6.1 x 10^-2)
= 4.9061 x 10^1
= 4.9 x 10^1

answer
C. 4.9 x 10^1

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Which is the interval notation represent the domain?

Kazeer [188]

Answer:

The first choice, $(-\infty, 7) \cup (7, \infty)$ .

Step-by-step explanation:

The dashed vertical line is a vertical asymptote. The x-coordinate of all points on this vertical asymptote are equal to 7. In other words, when the x-value of a point on the graph approaches $7$ , its y-value approaches infinity (or negative infinity.)

Either way, the graph is not defined for $x = 7$ . The point $7$ should thus be excluded from the domain of the graph.

The graph is apparently defined for all other x-values. The domain of the function should thus be all real numbers with the exception of $x = 7$ . Here's how to write that in interval notation:

The set of all real numbers can be expressed as the interval $(-\infty, \infty)$ . Note that infinity $\infty$ (or $(- \infty)$ itself isn't a real number. The round brackets indicate that both endpoints are excluded from the from the interval.
The set of all real numbers less than (not equal to) $7$ is $(-\infty,7 )$ (both ends are excluded.) The set of all real numbers greater than (not equal to) $7$ is $(7, \infty)$ .
The set of all real numbers that is not equal to $7$ is the union of all real numbers less than $7$ and all real numbers greater than $7$ . The union operator $\cup$ connects two intervals.