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3 years ago

How many solutions does this system have? y=3/4x-5 -3x+4y=-20?

Mathematics

1 answer:

Komok [63]3 years ago

4 0

4y=-20+3x and 4y=13.6x-20
so
-20+3x=13.6x-20
3x=13.6x
3=13.6 so it is wrong and system doesn’t have solution

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Simplify the following expression 4 + 3 . 7

Brilliant_brown [7]

Multiply the numbers
4 + 3 . 7
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4 0

2 years ago

Find the surface area of composite figure. Please help

Ivan

Answer:

The surface area of the composite figure is $410\ m^{2}$

Step-by-step explanation:

we know that

The surface area of the composite figure is equal to the surface area of the rectangular prism of the bottom plus the lateral area o the rectangular prism of the top

Step 1

Find the surface area of the rectangular prism of the bottom

The surface area is equal to

$SA=2B+Ph$

Find the area of the base B

$B=10*10=100\ m^{2}$

$P=4*10=40\ m$

$h=3\ m$

substitute

$SA=2(100)+40(3)=320\ m^{2}$

Step 2

Find the lateral area of the rectangular prism of the top

The lateral area is equal to

$LA=Ph$

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$h=5\ m$

substitute

$LA=18(5)=90\ m^{2}$

Step 3

Find the surface area of the composite figure

$320\ m^{2}+90\ m^{2}=410\ m^{2}$

8 0

2 years ago

What multiplys to -10.9375 and adds up to 2.5?

fgiga [73]

I hope this helps you

3 0

2 years ago

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Dmitriy789 [7]

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Read 2 more answers

How to rationalize the denominator of sqrt(a)/sqrt(a)-2

aivan3 [116]

Answer:

√a(√a + 2) a - 2√a

----------------- = -----------------

a - 4 a - 4

Step-by-step explanation:

I am assuming that by "sqrt(a)/sqrt(a)-2" you meant:

√a

----------

√a - 2

To rationalize the denom., multiply numerator and denom. of this fraction by the conjugate of √a - 2, which is √a + 2:

√a(√a + 2)

-----------------

a - 4

3 0

3 years ago