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3 years ago

Please help me!It's urgent! I beg you guys

Mathematics

1 answer:

LiRa [457]3 years ago

6 0

Answer:

y = -13

Step-by-step explanation:

y = 3x - 1 equation(i)

2x - y = 5 equation(ii)

now substitute the value of y in equation(ii)

2x - y = 5

2x - (3x -1) = 5

2x - 3x + 1 = 5

-x = 5 -1

-x = 4

x = -4

again substitute the value of x in equation (i)

y = 3x - 1

y = 3*-4 - 1

y = -12 - 1

y = -13

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Semicircles

Studentka2010 [4]

Answer:

The area of the shaded portion of the figure is $9.1\ cm^2$

Step-by-step explanation:

see the attached figure to better understand the problem

we know that

The shaded area is equal to the area of the square less the area not shaded.

There are 4 "not shaded" regions.

step 1

Find the area of square ABCD

The area of square is equal to

$A=b^2$

where

b is the length side of the square

we have

$b=4\ cm$

substitute

$A=4^2=16\ cm^2$

step 2

We can find the area of 2 "not shaded" regions by calculating the area of the square less two semi-circles (one circle):

The area of circle is equal to

$A=\pi r^{2}$

The diameter of the circle is equal to the length side of the square

$r=\frac{b}{2}=\frac{4}{2}=2\ cm$ ---> radius is half the diameter

substitute

$A=\pi (2)^{2}$

$A=4\pi\ cm^2$

Therefore, the area of 2 "not-shaded" regions is:

$A=(16-4\pi) \ cm^2$

and the area of 4 "not-shaded" regions is:

$A=2(16-4\pi)=(32-8\pi)\ cm^2$

step 3

Find the area of the shaded region

Remember that the area of the shaded region is the area of the square less 4 "not shaded" regions:

$A=16-(32-8\pi)=(8\pi-16)\ cm^2$

---> exact value

assume

$\pi =3.14$

substitute

$A=(8(3.14)-16)=9.1\ cm^2$

8 0

3 years ago

Define the pattern 1,3,9,27 next three terms

mixer [17]

81 , 243 , 729 the pattern is mutiply each by three

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2 years ago

Read 2 more answers

a carnival charges $8.50 per ticket for adults and $4.50 per ticket for children. which expression represents the total price a

ra1l [238]

The answer is D <span>8.5x + 4.5y</span>

3 0

3 years ago

-5X +1 92 - 321+13 - 12X

Bogdan [553]

Answer:

Step-by-step explanation:

There’s no equal sign.

8 0

3 years ago

The function f(r) gives the area of a circle with radius r.

Darina [25.2K]

Answer:

A. 50.24

Step-by-step explanation:

Put the value where the variable is and do the arithmetic.

f(4) = 3.14(4²) = 3.14×16 = 50.24

8 0

2 years ago