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3 years ago

Please help me with this i will give brainliest

Mathematics

1 answer:

dmitriy555 [2]3 years ago

8 0

Answer:

the first one and the last one,

Step-by-step explanation:

I took the test :) hope you pass

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The perimeter of a rectangle is twice the sum of its length and width the peremeter is 28 meters

Roman55 [17]

The right answer is 12 m

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3 years ago

A = √7 + √c and b = √63 + √d where c and d are positive integers.

mrs_skeptik [129]

Answer:

$\displaystyle a:b=\frac{1}{3}$

Step-by-step explanation:

Ratios

We are given the following relations:

$a=\sqrt{7}+\sqrt{c}\qquad \qquad[1]$

$b=\sqrt{63}+\sqrt{d}\qquad \qquad[2]$

$\displaystyle \frac{c}{d}=\frac{1}{9} \qquad \qquad [3]$

From [3]:

$9c=d$

Replacing into [2]:

$b=\sqrt{63}+\sqrt{9c}$

We can express 63=9*7:

$b=\sqrt{9*7}+\sqrt{9c}$

Taking the square root of 9:

$b=3\sqrt{7}+3\sqrt{c}$

Factoring:

$b=3(\sqrt{7}+\sqrt{c})$

Find the ration a:b:

$\displaystyle a:b=\frac{\sqrt{7}+\sqrt{c}}{3(\sqrt{7}+\sqrt{c})}$

Simplifying:

$\boxed{a:b=\frac{1}{3}}$

3 0

3 years ago

2x + 3y =10 x + y = 3 please do workings asap

kompoz [17]

This is system of Equations.
2x + 3y =10
x + y = 3

x + y = 3 (multiply this by three) to get 3x + 3y = 9
2x + 3y =10
3x + 3y = 9 Subtract them

-1x = 1
x=-1
Now plug x back into the top equation and solve for y.

I hope this helps! If not, let me know! Have a fantastical day!

5 0

4 years ago

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3 years ago

Please help i will give brainlyest i promise

oksian1 [2.3K]

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