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3 years ago

Solve the system of equations and choose the correct ordered pair. 2x + 5y = 15 5x + 10y = 35

Mathematics

1 answer:

horrorfan [7]3 years ago

4 0

X=5 and Y= 1 Hope this helps!

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An = 5 - 7n. What is the value of a12?

Delicious77 [7]

Answer:

The value of $a_{12}=-79$

Step-by-step explanation:

Being the general expression of the sequence:

$a_n=5-7n$

We replace the value n=12 to get

$a_{12}=5-7\times 12=5-84=-79$

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3 years ago

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You need the total amount of how many animals

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Scientists are monitoring a whale's weight by observing its weight change once a week, over a 4 week period. How much has the wh

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Step-by-step explanation:

-2.2 - (-1.7) - (-0.4) = -4.2 + 0.3 = -3.9

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3 years ago

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Helena creates two similar rectangles using exactly 100 cm of string. The smaller rectangles width and length are 4 cm by 6 cm r

Misha Larkins [42]

Answer:

The dimensions of the larger rectangle are $24\ cm$ of length by $16\ cm$ of width

Step-by-step explanation:

Let

x-----> the length of the larger rectangle

y-----> the width of the larger rectangle

we know that

$\frac{x}{y}=\frac{6}{4}$ ------> by similar rectangles

$x=1.5y$ -----> equation A

<u>Find the perimeter of the smaller rectangle</u>

$P=2(6+4)=20\ cm$

<u>Find the perimeter of the larger rectangle</u>

Subtract the perimeter of the smaller rectangle from 100 cm of string

$P=100-20=80\ cm$

Remember that

$80=2x+2y$ ------> $40=x+y$ ------> equation B

substitute equation A in equation B

$40=1.5y+y$

$2.5y=40$

$y=16\ cm$

Find the value of x

$x=1.5(16)=24\ cm$

The dimensions of the larger rectangle are $24\ cm$ of length by $16\ cm$ of width

3 0

3 years ago

Help!! 5.1 q2 Algebra

ICE Princess25 [194]

Answer:

4y^2-y+21

Step-by-step explanation:

(4y-5y)+(5y^2-y^2)+(-6+27)

-y+4y^2+21

put it in standard form

4y^2-y+21

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3 years ago