Which of the following is a prime number? Select one: A. 19 B. 20 C. 21 D. 22

Answer:

x= 1 , y=4

Step-by-step explanation:

x-y= -3 => Equation 1

x+5y= 21 => Equation 2

Substitution Method:

Substitute Equation 1=>

x=y-3 <= Equation 3

Put x=y-3 in Equation 2:

x+5y=21

( y-3)+5y=21

y-3+5y=21

6y-3=21

6y=21+3

6y=24

y=24÷6

y=4

Put y=4 in Equation 1:

x-y= -3

x-4=-3

x=4-3

x=1

Hope this helps :)

Answer:

x = 1

y = 4

Step-by-step explanation:

x - y = -3   then x = y - 3

x + 5y = 21

substitute for x:

y - 3 + 5y = 21

reduce:

6y = 24

y = 4

x = 4 - 3 = 1

check:

1 - 4 = -3

-3 = -3

and

1 + 5(4) = 21

21 = 21

Answer:

72.4 and 107.6

Step-by-step explanation:

on delta math

Answer:

Step-by-step explanation:

The answer would be A. 1 1/5

48/40 = 1 8/40

1 8/40 Simplify to 1 1/5

Hope this helps!

Answer:

I think it's vertex bestie not sure tho lmk if it's wrong

Answer:

x=15.714

y=5.715

Step-by-step explanation:

Answer:

x=10, y=20

Step-by-step explanation:

okay so to find x, or the way I did it, we just have to look at the top, we know one line is 180 degrees, and we see three angles, 7x,90, and 20

so 90+20+7x=180

and:110+7x=180

therefore: 7x=70

and finally: x=10

To find y also isn't had if we just look at the blue and green lines we see they are intersecting and opposite angles in intersecting lines are congruent meaning they are the same. So we now know that:

5x+2y=90

and we know x=10

so 5x=50

meaning that: 50+2y=90

therefore: 2y=40

and in conclusion y=20

Answer:

Step-by-step explanation:

A

Answer:

12x-39

Step-by-step explanation:

40-1=39

Answer:

Step-by-step explanation:

20% of 30 is 6 are randomly selected.

30 choose 6 = 30! / (30-6)! 6!

                 = 30! / 24!6!

                 = 30 * 29 * 28 * 27 * 26 * 25

                   --------------------------------- <-- 24! cancels

                    6 * 5 * 4 * 3 * 2 * 1

                 = 29 * 28 * 27 * 26 * 25

                  ---------------------------------- <--- 30 = 6 * 5 cancels

                      4 * 3 * 2 * 1

                = 29 * 7 * 9 * 13 * 25   <--  4 cancels 28, 3 cancels 27, 2 cancels 26

               = 593775

Answer:

96

Step-by-step explanation:

100%-60%=40%

40% of x = 64 students (X=Total no. of students)

(40/100)*x=64

x=64*(100/40)

x=160

Missing no. of students=160-64=96

Answer:

96 students

Pls mark me brainliest!

Step-by-step explanation:

If an unknown amount of students is 60% of the students, the 64 of the students must be 40% of the students because 40+60 = 100.

You want to find what 1% equals, so we will divide 64 by 40 because 40% divided by 40 = 1% and whatever you do to one side you do to the other.

64/40 = 1.6

Assuming that the ? number of students that equals 60% will be a whole number, lets go with 1.6.

If 1.6 = 1%, and we want 60%, then multiply both sides by 60, because 1*60 = 60.

1.6*60 = 96

96 students

Answer: -1/3

Step-by-step explanation: slope is the difference in the y values over the difference in the x values

Answer:

19) 0.8000

20) 0.8824

21) 0.2800

22) 1.8750

23) 0.8000

24) 0.8000

Step-by-step explanation:

sin = opp/hyp

cos = adj/hyp

tan = opp/adj

19) sin Z = 40/50 = 0.8

20) sin C = 30/34 = 0.882352941

21) sin A = 7/25 = 0.28

22) tan X = 30/16 = 1.875

23) cos X = 28/35 = 0.8

24) cos C = 36/45 = 0.8

Answer:

Since them taken same time so the fraction is 1/1

Answer:

a = 2 √13 cm

Step-by-step explanation:

Here, we want to find the length of BC

To do this, we can use the cosine rule

Thus;

a^2 = b^2 + c^2 - 2BC cos A

= 8^2 + 6^2 - 2(8)(6) cos 60

Mathematically cos 60 = 1/2

= 64 + 36 - 48 = 52

a^2 = √52

a = 2 √13 cm

Answer:

48

Step-by-step explanation:

just because it is

Answer:

b = -(4a + c)/4

Step-by-step explanation:

sum of a, b, and c is five times the sum of a and b,

a + b + c = 5(a + b)

which of the following expresses the value of b in terms of a and c?

a + b + c = 5(a + b)

a + b + c = 5a + 5b

a + c - 5a = 5b - b

-4a + c = 4b

b = -(4a + c)/4

Answer:

2(2y-1)+y=3

Step-by-step explanation:

y=ax=b

cx+dy=E

cx+d(ax+b)=e

SUBSTITUTION

Answer:

12

Step-by-step explanation:

ℎ ℎ 12

The bones of the body come in a variety of sizes and shapes. The four principal types of bones are long, short, flat and irregular. Bones that are longer than they are wide are called long bones. They consist of a long shaft with two bulky ends or extremities.

Los huesos del cuerpo tienen una variedad de tamaños y formas. Los cuatro tipos principales de huesos son largos, cortos, planos e irregulares. Los huesos que son más largos que anchos se llaman huesos largos. Consisten en un eje largo con dos extremos o extremidades voluminosas.

If i'm  wrong please tell me

Answer: 50% increase

Step-by-step explanation:

Think of 20 as 100%

Half of 20 is 10 which is 50% in this scenario.

30-20=10

This means that the price of the item increased by 50% or 10.

Answer:

It is 9

Step-by-step explanation:

9x - 2 = 79

9x = 81

x = 9

Answer:

Step-by-step explanation:b448

Answer:

81 units³

Step-by-step explanation:

V = Length x Widht x Height

= 9 x 3 x 3

= 81 units³

Answer:

D.   2 ≤ x ≤ 5

Step-by-step explanation:

Notice that there are no points on the graph for x ≤ 2 and x ≥ 5.  Or another way to look at it is that the x's are between 2 and 5, inclusive.

The domain is the set of possible x values.  Therefore,  2 ≤ x ≤ 5 is the set of  values for the domain

Answer:

[tex]m\leq \frac{1}{4}[/tex]

Step-by-step explanation:

[tex]\frac{1}{4}+m\leq \frac{1}{2}[/tex]

Simplify both sides in the inequality:

[tex]m+\frac{1}{4}\leq \frac{1}{2}[/tex]

Subtract 1/4 from both sides:

[tex]m+\frac{1}{4}-\frac{1}{4} \leq \frac{1}{2}-\frac{1}{4} \\m\leq \frac{1}{4}[/tex]

m ≤ 1/4 is your final answer.

Answer:

Step-by-step explanation:

x² + 6x - 8 = 4x + 7

x² + 2x - 15 = 0

(x+5)(x-3) = 0

x = -5, 3

y = 4x + 7 = -13, 19

-13 + 19 = 6