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3 years ago

Simplify the expression. helppp me plz do it right (xy)3·(–3x4y2)

Mathematics

2 answers:

klemol [59]3 years ago

7 0

I suggest you get photo math

Maru [420]3 years ago

7 0

Answer:

-3x^7y^5

Step-by-step explanation:

I assume the number 3 after parentheses is an exponent. I also assume that 4 after x and 2 after y are exponents. If so, please use the symbol ^ to show clearly it's an exponent.

(xy)^3 · (-3x^4y^2) =

= x^3 * y^3 * (-3x^4y^2)

= -3x^7y^5

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For what value(s) of k is the linear system consistent? (Enter your answers as a comma-separated list.)

AleksAgata [21]

Answer:

Step-by-step explanation:

Given

$6x_1-9x_2=8$

$9x_1+kx_2=-1$

The given system is $AX=B$ can be represented by

$\begin{bmatrix}6 &-9 \\ 9 & k\end{bmatrix}\begin{bmatrix}x_1\\ x_2\end{bmatrix}=\begin{bmatrix}8\\ -1\end{bmatrix}$

The given system is consistent when determinant of A is not equal to zero

$|A|$

$|A|=6k-(-81)=6k+81$

$k\neq \frac{-27}{2}$

i.e. system is consistent for all value of k except $k=\frac{-27}{2}$

$R-\frac{-27}{2}$

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3 years ago

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20 POINTS: Find the surface area of the figure. Round to the nearest hundredth if necessary.

stealth61 [152]

385.6 square feet is the answer

5 0

2 years ago

7.5% of what number is equal to 85% of 200?

Ksivusya [100]

Solving:

$\frac{7.5}{100} *x = \frac{85}{100} * 200$

$\frac{7.5x}{\diagup\!\!\!\!\!\!\!\!100} = \frac{17000}{\diagup\!\!\!\!\!\!\!\!100}$
$7.5x = 17000$
$x = \frac{17000}{7.5}$
$x = 2266.6666... \:\to \boxed{\boxed{x \approx 2266.67}}\end{array}}\qquad\quad\checkmark$

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3 years ago

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Arrange 3/5,5/8,5/6 and 7/4 in ascending order

melomori [17]

It’s already in ascending order.

3/5= .6

5/8= .625

5/6= .833

7/4= 1.75

6 0

2 years ago

20 km is how many dam

ZanzabumX [31]

Hello!

OK, so we need to find out 20 km = ? dam

What we know:
1 km = 100 dam

Now, lets multiply to get our answer:

20 × 100 = 2,000

This tells us that 20 km = 2,000 dam

Check:

2,000 ÷ 20 = 10

This tells us that we are CORRECT!

Answer: 20 km = 2,000 dam

Hope this helps! Good luck! (:

3 0

2 years ago