Help me idk what to do!!

Mathematics

1 answer:

Nastasia [14]4 years ago

7 0

Good advice would be to use the calculator that comes on all computers up to date. You could also do it by aligning the decimal points while solving the problem as you would any other problem with double digits or more. And, when you add a negative to a negative, it creates a larger negative number. When you add a positive number to a negative number, it is the same as subtracting. For extra special ones, such as 3, when you subtract a negative number from another negative number, you would take the negative number on the right, and change it to a positive to a positive, because two negatives create a positive. So, #3 would be -3.48 + 3.5, which would be .02.

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Let f(x) = 7x - 13. Find f-1(x).

nika2105 [10]

$f(x)=7x-13 \\ \\ y=7x-13 \ \ \ |+13 \\
y+13=7x \ \ \ |\div 7 \\
x=\frac{1}{7}y+\frac{13}{7} \\ \\
\boxed{f^{-1}(x)=\frac{1}{7}x+\frac{13}{7}}$

4 0

4 years ago

What is the absolute value of -15?

PIT_PIT [208]

The absolute value of -15 is 15, because -15 is 15 away from zero

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4 years ago

What is the answer

vichka [17]

An excluded value is one where the bottom of the fraction = 0.

In your case 1-3x=0
1=3x
x=1/3

At this point, the function does not exist. If you were to draw a graph of it, there wouldn't be a y-value corresponding to x=1/3.

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3 years ago

ms anderson bought 45 baseball hats. Mets hats cost $18 and Yankee hats cost $24. If she spent $1050, how many of each did she b

DerKrebs [107]

First, you have to set up two equations. X + y = 45 18x + 24y = 1,050 To do this, you have to solve for an exponent by cancelling out the other one. To solve for y, you multiply everything in the first equation by -18. -18x -18y = -810 This cancels out the x and leaves you with 6y = 240. Divide both sides by 6 and you have the number of Yankee hats that were bought. Then, you have to substitute 40 for y in the first equation and solve for x.

5 0

3 years ago

Find the number of sides of a regular polygon given the measure of one interior angle.

dolphi86 [110]

Answer: Number of sides of regular polygon is 2.

But with two sides it can't form polygon.

Step-by-step explanation:

Since we have given that

Measure of one interior angle is given by

$9.144\textdegree$

so, As we know that to get an exterior angle , we will use "Linear pair":

Let exterior angle be x.

$x+9.144\textdegree=180\textdegree\\\\x=180\textdegree-9.144\textdegree\\\\x=170.856\textdegree$

Now, we know the formula for " Number of sides ":

$\text{Number of sides }=\frac{360}{x}\\\\\text{Number of sides }=\frac{360}{170.856}\\\\\text{Number of sides }=2.1\\\\\text{but number of sides can't be in decimal.So,}\\\\\text{Number of sides }=2$

Hence, Number of sides of regular polygon is 2.

But with two sides it can't form polygon.

6 0

4 years ago