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2 years ago

Solve the system of equations by elimination. -x + y = -13 -8x - 4y = -8

Mathematics

2 answers:

ivann1987 [24]2 years ago

4 0

Answer:

x=5 and y=−8

Hope this helps

LiRa [457]2 years ago

4 0

Sorry if it’s confusing but it’s x=21 and y=8

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What is the area of trapezoid ABCD in square centimeters?

anyanavicka [17]

Answer:

Step-by-step explanation:

Area of trapezium = 1/2 × (sum of parallel sides × height)

The parallel sides of the trapezium are the left and right edge.

( 9 + 13) = 22

The height is the vertical distance between the parallel sides and when you turn the shape 90degrees towards the left, we would have the parallel sides been the bottom and top edge and the vertical height between will be 9

Hence the area = 1/2 × 22 × 9

= 11 ×9 = 99

You would add the unit if measure.

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3 years ago

Both circle Q and circle R have a central angle measuring 140°. The area of circle Q's sector is 25π m2, and the area of circle

taurus [48]

Solution:

we are given that

Both circle Q and circle R have a central angle measuring 140°. The area of circle Q's sector is 25π m^2, and the area of circle R's sector is 49π m^2.

we have been asked to find the ratio of the radius of circle Q to the radius of circle R?

As we know that

Area of the sector is directly proportional to square of radius. So we can write

$Area \ \ \alpha \ \ r^2\\ \\ \Rightarrow A=kr^2\\ \\ \text{where k is some proportionality constant }\\ \\ \Rightarrow \frac{A_1}{A_2}=\frac{r_1^2}{r_2^2}\\ \\ \Rightarrow \frac{r_1^2}{r_2^2}=\frac{A_1}{A_2}\\ \\ \Rightarrow \frac{r_1^2}{r_2^2}=\frac{25 \pi}{49 \pi}\\ \\ \Rightarrow \frac{r_1}{r_2}=\sqrt{\frac{25 \pi}{49 \pi}} \\ \\ \Rightarrow \frac{r_1}{r_2}=\frac{5}{7} \\$

7 0

3 years ago

Read 2 more answers

7. Which is the graph of y = 23 x? please help me with this, thank you:)

sladkih [1.3K]

Answer:

Step-by-step explanation:

Graph D has a positive slope. The line goes up 2 units and right 3 units.

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2 years ago

5+656+-425*3/4<35-73*3/7

Komok [63]

The answer is false

if you solve both sides it says that 627.25 is less than 3.714 which isn't correct because 627.25 is obviously greater than 3.714

5 0

3 years ago

Gardener has 780 plants. He wants to plant there in such a way that the number of rows and the numbers of columns remains same.

AleksAgata [21]

Answer:

Gardener will need 4 more plants.

Step-by-step explanation:

Gardener has 780 plants and wants to plant them in an array of n rows and n columns.

The number of plants needed to do that is:

$n*n=n^2$

He actually has 780 plants, thus it should occur:

$n^2=780$

Taking the square root:

n=27.9

Since n needs to be an integer, we round up n to get

n=28

But $28^2=784$ , 4 more than the actual number of plants, thus:

Gardener will need 4 more plants.

Note: There are other possible results for n. If we set n=29, then $n^2=841$ and Gardener would need 841-780=61 more plants, but the question asked for the minimum number of plants.

5 0

3 years ago