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2 years ago

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Select all expressions that have a sum or difference of 3 /4 . A. 1 /2 + 2/ 4 B. 11/ 12 − 1 /6 C. 3 /5 + 3 /20 D. 7/ 8 − 1 /2 E.

2 /3 + 1 1/2

2 answers:

madam [21]2 years ago

7 0

Answer:

c..

Step-by-step explanation:

Shkiper50 [21]2 years ago

3 0

The answer is C it’s really easy

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The diagram show the approximate length and width of Nevada. Estimate the area of the state

tester [92]

Area of a triangle is 0.5(base x height)

Base = 320mi

Height= 270+210= 480mi

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3 years ago

Write the rule for the following arithmetic sequence: 11, 15, 19, 23, …

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11,15,19,23

an = 11 + 4(n-1)
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2 years ago

The length of an edge of a cube is 9 centimeters. What is the volume of the cube?

KATRIN_1 [288]

Answer:

729

Step-by-step explanation:

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2 years ago

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The function (t) = 300,000t represents the distance (in kilometers) that light travels in t seconds

Anika [276]

Answer:

The answer is: 4,500,000 kilometers or in scientific notation: 4.5 x 10^6 kilometers.

Step-by-step explanation:

Multiply to get the answer:

300,000 * 15 =

4,500,000 km

In scientific notation: 4.5 x 10^6

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2 years ago

Solve the following system of linear equations: 3x1+6x2+6x3 = -9 -2x1–3x2-3x3 = 3 If the system has infinitely many solutions, y

choli [55]

Answer:

The set of solutions is $\{\left[\begin{array}{c}x\\y\\z\end{array}\right]=\left[\begin{array}{c}12\\-7-r\\r\end{array}\right]: \text{r is a real number} \}$

Step-by-step explanation:

The augmented matrix of the system is $\left[\begin{array}{ccccc}3&6&6&-9\\-2&-3&-3&3\end{array}\right]$ .

We will use rows operations for find the echelon form of the matrix.

In row 2 we subtract $\frac{2}{3}$ from row 1. (R2- 2/3R1) and we obtain the matrix $\left[\begin{array}{cccc}3&6&6&-9\\0&1&1&-7\end{array}\right]$
We multiply the row 1 by $\frac{1}{3}$ .

Now we solve for the unknown variables:

$x_2+x_3=-7$ , $x_2=-7-x_3$
$x_1+2x_2+2x_3=-2$ , $x_1+2(-7-x_3)+2x_3=-2$ then $x_1=12$

The system has a free variable, the the system has infinite solutions and the set of solutions is $\{\left[\begin{array}{c}x\\y\\z\end{array}\right]=\left[\begin{array}{c}12\\-7-r\\r\end{array}\right]: \text{r is a real number} \}$

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3 years ago