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3 years ago

Select all the true sentences!!!

Mathematics

2 answers:

pishuonlain [190]3 years ago

6 0

Answer:

only the 1st is true

Step-by-step explanation:

the rest are wronf

ludmilkaskok [199]3 years ago

6 0

First is correct

...............

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63% of 300 is what number

PolarNik [594]

Answer:

189

Step-by-step explanation:

You take 63% make it a decimal by dividing it by 100 and then you multiply it with 300. 300*.63=189.

6 0

3 years ago

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The perimeter of a rectangular garden is 44 meters. The length of the rectangle is 5 less than twice the width. Find the length

defon

9514 1404 393

Answer:

width: 9 m
length: 13 m

Step-by-step explanation:

Let w represent the width. Then the length is 2w-5, and the perimeter is ...

P = 2(L+W)

44 = 2((2w-5) +w)

44 = 6w -10

54 = 6w

9 = w

2(9) -5 = 13 = length

The length of the rectangle is 13 meters; the width is 9 meters.

6 0

3 years ago

Which value, when placed in the box, would result in a system of equations with infinitly many solutions? Y=2x - 5 2y-4x=

Nezavi [6.7K]

Given:

The system of equations is

$y=2x-5$

$2y-4x=?$

To find:

The missing value for which the given system of equations have infinitely many solutions.

Solution:

Let the missing value be k.

We have,

$y=2x-5$

$2y-4x=k$

Taking all the terms on the left side, the given equations can be rewritten as

$-2x+y+5=0$

$-4x+2y-k=0$

The system of equations $a_1x+b_1y+c_1=0$ and $a_2x+b_2y+c_2=0$ have infinitely many solutions if

$\dfrac{a_1}{a_2}=\dfrac{b_1}{b_2}=\dfrac{c_1}{c_2}$

We have,

$a_1=-2,b_1=1,c_1=5$

$a_2=-4,b_2=2,c_2=-k$

Now,

$\dfrac{-2}{-4}=\dfrac{1}{2}=\dfrac{5}{-k}$

$\dfrac{1}{2}=\dfrac{1}{2}=\dfrac{5}{-k}$

$\dfrac{1}{2}=\dfrac{5}{-k}$

On cross multiplication, we get

$-k=10$

$k=-10$

Therefore, the missing value is -10.

6 0

3 years ago

Please help, I'm trying to figure this out. I'll give branliest!

SVETLANKA909090 [29]

A. 18 cm
To find the area of a trapezoid, take the sum of its bases, multiply the sum by the height of the trapezoid, and then divide the result by 2

3 0

3 years ago

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Use summation notation to write the series for five terms

strojnjashka [21]

Answer:

$\large\boxed{\sum\limits_{n=1}^5(-2.2+8.8n)}$

Step-by-step explanation:

$6.6,\ 15.4,\ 24.2,\ ...\\\\\text{It's an arithmetic sequence:}\\\\15.4-6.6=8.8\\24.2-15.4=8.8\\\\\text{The difference is constant.}\\\\\text{The explicit formula of an arithmetic sequence:}\\\\a_n=a_1+(n-1)d\\\\\text{Substitute:}\\\\a_1=6.6\ \text{and}\ d=8.8\\\\a_n=6.6+(n-1)(8.8)=6.6+8.8n-8.8=8.8n-2.2\\\\\text{Therefore}\\\\\sum\limits_{n=1}^5(8.8n-2.2)$

5 0

4 years ago