All categories

2 years ago

Please help me with my math I’m so bad at this

Mathematics

1 answer:

mojhsa [17]2 years ago

7 0

Answer:

Step-by-step explanation:

(-9)^1/3 * (-81)^1/3

We can rewrite -81 as 9 * -9

So it can be rewritten as:

(-9)^1/3 * (9*-9)^1/3

Since they are all raised to the 1/3, we can combine the bases:

(-9*9*-9)^1/3 =

(9*9*9)^1/3, because the two negatives turn into a positive:

So this is basically:

(9^3)^1/3 = 9^1 = 9

You might be interested in

A box contains 17 balls numbered 1 through 17. Two balls are drawn in succession without replacement. If the second ball has the

Brilliant_brown [7]

Answer:

1 ; 7 /17

Step-by-step explanation:

17 balls numbered 1 through 17

Picking without replacement :

If the second ball picked = 4

P(first ball has a smaller number)

Numbers less Than = (3, 2, 1)

P(number less than second ball Given 4 is drawn for second ball) :

= (3/17 * 1/16) ÷ (3/17 * 1/16) +) 14/17 * 0)

= (3 / 272) / (3 /272) * 0

= 3 / 272 * 272 / 3

= 1

2.)

(8/17 * 7/8) ÷ (8/17 * 7/8) + (9/17 * 1/17)

7/17 ÷ (7 /17) + 10/17

7 /17 ÷ 17/17

7/17 ÷ 1

7 /17

7 0

3 years ago

Mona drove 40 miles per hour how long will it take Mona to drive 100 miles

seraphim [82]

Answer:

2,5h

if she's driving at 40 miles per hour, that means in 2 hours she will have driven 80 miles plus 30 mins. for another 20 miles. In total - 2h 30mins.

7 0

3 years ago

Translate the following written expression into a mathematical expression. Then, find the expression's value when a = 186 and b

antoniya [11.8K]

Answer: The correct answer is option A: 6

Step-by-step explanation: We shall start by splitting the word problem into bits to ease our calculations.

We start with “the quotient of a and 6...” and that can be expressed as

a/6 where a equals 186, this becomes

186/6 and this equals 31.

Note that quotient means the result derived from dividing two numbers/values.

Next, “The difference of ... and b squared”

The missing part of this statement has been calculated as 31, so this can now be written as “The difference of 31 and b squared” where b equals 5 and b squared now equals 25. Hence what we have is the difference of 31 and 25

That is, 31 - 25 and that equals 6.

Therefore, the expression can now be written out as;

(a/6) - b^2

When a equals 186 and b equals 5, the answer is 6

8 0

2 years ago

Audrey is trying to find the equation of a line parallel to y = 2 over 3x _5 in slope-intercept form that passes through the poi

KiRa [710]

A line parallel to y = 2/3 x - 5 will have a slope of 2/3.
The equation of a line passing through (-6, -1) with a slope of 2/3 is
y - (-1) = 2/3 (x - (-6))

4 0

2 years ago

Read 2 more answers

4 ( 2x-2 ) +2 = 4 ( x- 2 )

IRINA_888 [86]

Answer:

$x=-\frac{1}{2}$

Step-by-step explanation:

$4(2x-2)+2=4(x-2)$

First, let's go over the <em>distributive property </em>in math. When you have any expression within a parenthesis being multiplied by any expression outside a parenthesis, you are distributing the values outside onto the values inside, like so:
$a(b+c)$ ⇒ $ab+ac$
Hopefully this helps you break down how distribution works, but if you're still having trouble comprehending it, looking at examples will help. Now, back to the problem. Let's try this idea of distribution on the left side of the equation.

$4(2x-2)+2=4(x-2)\\((4)2x-(4)2)+2=4(x-2)\\(8x-8)+2=4(x-2)$

Hopefully you could follow this math, but if not, there are plenty of materials online and in books on this. Be sure to look at those if you still have trouble.
Now that we have done all the multiplication we can on the left side and only addition and subtraction remain, we can get rid of the parentheses.

$(8x-8)+2=4(x-2)\\8x-8+2=4(x-2)\\8x-6=4(x-2)$

Now let's do distribution for the other side as well. Doing this will help us easily isolate $x$ on one side after.

$8x-6=4(x-2)\\8x-6=((4)x-(4)2)\\8x-6=4x-8$

Now, using addition and subtraction, let's move all our $x$ values to one side of our equation and all other values to the other. It doesn't matter which side you choose.

$8x-6=4x-8\\4x=-2\\\frac{4x}{4}=\frac{-2}{4}$

In case you're confused by the last step there, what I did was divide both sides by the coefficient in front of our $x$ values. This will cancel the coefficient out and leave us with our solution.

$\frac{4x}{4}=\frac{-2}{4}\\x=\frac{-1}{2}=-\frac{1}{2}$

The fraction $\frac{-2}{4}$ is technically correct, but it isn't simplified. $\frac{-2}{4}$ can be simplified to $-\frac{1}{2}$ , so $-\frac{1}{2}$ is our final answer.

$x=-\frac{1}{2}$

5 0

2 years ago