All categories

4 years ago

Please help will mark brainliest

Mathematics

2 answers:

atroni [7]4 years ago

7 0

1,4,5,8

Hope this helps! <3

(Im so sorry if its wrong i havent done these in a while but in 99% sure)

FromTheMoon [43]4 years ago

7 0

1,4,5,8 is the correct answer

You might be interested in

Find the point of intersection (if any) of the following pairs of lines: a) x – 2y +1=0 2x + 3y – 7 = 0 b) x-2y+11=0 -x+2y-13 =

pychu [463]

Answer:

a) (11/7, 9/7)

b) There's no point of intersection

Step-by-step explanation:

a) x - 2y + 1 = 0

2x + 3y - 7 = 0

To find the point of intersection, we need to solve the system of equations and the result will be the point of intersection (x,y)

$x-2y+1=0\\x= 2y-1$

Now we substitute x in the second equation:

$2x+3y-7=0\\2(2y-1)+3y-7=0\\4y-2+3y-7=0\\7y-9=0\\y=9/7$

Now we substitute y in our first equation.

$x-2y+1=0\\x-2(9/7)+1=0\\x-18/7+1=0\\x=18/7-1\\x=11/7$ .

The point of intersection is (11/7, 9/7)

b) x -2y +11 =0

-x + 2y - 13 =0

We are going to follow the same procedure:

$x-2y+11=0\\x=2y-11$

$-(2y-11)+2y-13=0\\-2y+11+2y-13=0\\0y=2\\0=2$

Since this system of equations doesn't have a solution, the system has no point of intersection.

5 0

3 years ago

23 cm

Alenkasestr [34]

Answer:

445.2 square cm

Step-by-step explanation:

The surface area consists of area of two bases and area of three leteral faces. Each lateral face is a rectangle with length of 23 cm and width of 6 cm.

The area of rectangle is

$A_{rectangle}=\text{length}\times\text{width}$

So,

$A_{rectangle}=23\times 6=138\ cm^2$

The area of base is given as $15.6\ cm^2$

Thus, the surface area is

$SA=2A_{base}+3A_{lateral\ face}\\ \\SA=2\cdot 15.6+3\cdot 138=445.2\ cm^2$

5 0

4 years ago

There must be at least 8 students enrolled for the dance class to be offered. Otherwise, the class will be cancelled. There are

rodikova [14]

S≤12 s is equal to or less than 12 because 20 minus 12 equals 8. The class will still be held. Any number less than 12, there will be more students than 8 and the class will still be held.

7 0

3 years ago

Every row consists of 2,3 and 2 seats each. If there are 51 horizontal rows, and 13 seats are empty. How many passengers are on

monitta

Answer:

344

Step-by-step explanation:

7 0

3 years ago

A chef needs vinegar with an 8% acidity level to make her special sauerbraten. She only has two types of vinegar, one with an ac

miss Akunina [59]

Answer:

She should add 30 ounces of the 12% vinegar she should add to 40 ounces of the 5% vinegar to obtain the needed vinegar with an 8% acidity level.

Step-by-step explanation:

Let X be ounces of the 12% vinegar she should add to 40 ounces of the 5% vinegar to obtain the needed vinegar with an 8% acidity level.

We have the equation

$\frac{(X*0.12)+(40*0.05}{X+40} =0.08$ when 8% acidity level is reached.

Solving the equation we have

X*0.12+2=0.08(X+40)=0.08X+3.2

That is 0.12X-0.08X=3.2-2=1.2

Finally 0.04X=1.2 and

X=30

8 0

3 years ago