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3 years ago

Calcule o valor de: a)

Mathematics

1 answer:

Korvikt [17]3 years ago

7 0

Log 3 is the correct answer

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bazaltina [42]

27——————————————————-

5 0

3 years ago

Is integer x<−20 ? x2+40x+391=0 x2=529 Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient to answer

sukhopar [10]

Answer:

Both statements (1) and (2) TOGETHER are sufficient to answer the question asked; but NEITHER statement ALONE is sufficient.

Step-by-step explanation:

Solving the equation of statement (1) with the quadratic formula:

$x_{1,2}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$

$x^2+40x+391=0\\x_{1,2}=\frac{-40\pm\sqrt{40^2-4(1)(391)}}{2(1)}\\x_{1,2}=\frac{-40\pm\sqrt{1600-1564}}{2}\\x_{1,2}=\frac{-40\pm\sqrt{36}}{2}\\x_{1}=\frac{-40+6}{2}=\frac{-34}{2}=-17\\x_{1}=\frac{-40-6}{2}=\frac{-46}{2}=-23\\$

In this equation, one of the values of x is bigger than -20 but the other is smaller, this statement doesn't give enough information to answer the question.

Solving the quadratic equation of the statement (2):

$x^2=529\\x_{1,2}=\pm\sqrt{529} \\x_1=\sqrt{529}=23\\x_2=-\sqrt{529}=-23$

Again, one of the values of x is bigger than -20 and the other is smaller than -20. But if the information of this statement is considered along with the other x must be equal to -23, that is the value that appears as an answer in both equations, and with this information is possible to answer the question.

7 0

3 years ago

What is the slope of the line described by the equation below?<br> y=10x2

bulgar [2K]

Answer:

This line is exponential and has no slope

5 0

3 years ago

Read 2 more answers

Allen is building bird houses that require 1/2 feet long. How many pieces that are exactly 1/2 feet long can be made from a boar

Varvara68 [4.7K]

There are 2 halfs in 1 and 1/4 can't make a half so the answer is..

16

3 0

3 years ago

Please help me!<br> x-7>10<br><br> x>__?

tester [92]

Answer:

$x>17$

Step-by-step explanation:

We can treat an inequality just the same as an equality in terms of manipulation!(This doesn't hold for multiplying or dividing by negative numbers, but it holds for all addition).

So, we can add $7$ to both sides of the inequality to get $x-7+7>10+7$ .

We can simplify $-7+7$ into $0$ , and $10+7$ into $17$ .

So, the answer is $\boxed{x>17}$ and we're done!

3 0

3 years ago