Mathematics High School

Factorise these expressions
a.
[tex] {x}^{2} + 20x + 19[/tex]
b.
[tex] {z}^{2} - 2z + 1[/tex]
c.
[tex]9(x - 1) - 3x[/tex]
​

Answers

Answer 1

Answer:

a. (x+19)(x+1)

b. (z-1)(z-1)

c. 3(2x-3)

Step-by-step explanation:

a. x^2+20x+19

(x+19)(x+1)

b. z^2-2z+1

(z-1)(z-1)

c. 9(x-1)-3x

9x-9-3x

6x-9

3(2x-3)

Related Questions

2 is multipled by the difference of a number and 4.

Answers

Answer:

4

Step-by-step explanation:

it is 4 because 4-2=2

2*2=4

Answer:  2(x - 4)

Step-by-step explanation:

In the triangle below, ∠Q is a right angle. Which ratio would be equivalent to the ratio of sin∠R?
a) cos∠Q
b) cos∠S
c) sin∠Q
d) sin∠S

Answers

Answer:

b) cos∠S

Step-by-step explanation:

sin ∠R = SQ/SR

This is same as:

cos S

Correct option is b)

cos<Q

Lets do

[tex]\\ \sf\longmapsto sin<R=\dfrac{P}{H}[/tex]

[tex]\\ \sf\longmapsto sin<R=\dfrac{SQ}{SR}[/tex]

Now

[tex]\\ \sf\longmapsto cos<Q=\dfrac{B}{H}[/tex]

[tex]\\ \sf\longmapsto cos<Q=\dfrac{SQ}{SR}[/tex]

In the zoo, there are 12 elephants, 8 giraffes, 9 lions, 10 seals, and 16 otters.

What is the ratio of elephants to all the animals at the zoo?

Answers

Answer:

16/55

Step-by-step explanation:

If you add all the animals together then put it in fraction form you have 16/55

THE ANSWER SHOULD BE 12:55

Eliz spends $16.25 each month on song downloads. At this amount, how much will Eliz spend on song downloads after two years
?

Answers

Answer:

$390.00

Step-by-step explanation:

$16.25×24=390.00

=$390.00

in a search engine, 40,000 searches are done every minute.
How many searches are done in an hour?
write your answer in standard index form

Answers

Answer:

2400000 in a hour

Step-by-step explanation:

40,000 × 60 = 2400000 you need to multiple 40,000 with 60 because there is 60 minutes in a hour

y is an irrational number between 3 and 4 . what is the value of y

Answers

Answer:

If a and b are two positive rational numbers such that ab is not a perfect square of a rational number, then ab is an irrational number lying between a and b.

So  an irrational number between 3 and 4 is=3×4=3×4=3×2=23

If £21 = 500 rubles, how many £ are in 780 rubles? Give your answer to 2 dp.

Answers

Answer:

£32.76

Step-by-step explanation:

21/500=0.042

780x0.042 = 32.76

whats A-84=747 in its simplest form

Answers

Answer:

A=747+84=831

Step-by-step explanation:

Plus 84 at both side

Answer: A=831

Step-by-step explanation: Hope this helps have a nice day! -Lily ^-^

4. Look at the model. Write three equivalent fractions for the shaded part.
(3 pts)

Answers

Answer:

1/2,5/10,4/8

Step-by-step explanation:

half of the box is shaded.

this means that 1/2 is shaded.

also, there are 5/10 boxes shaded.

we can make up another one: 4/8

all of these can be reduced to 1/2.

Need help ASAP
Thankss + BRAINLIST only for correct answer

Answers

Answer:

(2,0)

Step-by-step explanation:

2x-y=4

Substitute x with 2, and y with 0.

2(2)-0=4

2 multiplied to 2 is 4, then subtracted to 0 would be 4, thus it is correct.

3x-y=6

Substitute x with 2, and y with 0.

3(2)-0=6

3 multiplied to 2 is 6, then 6 subtracted with 0 is 6, thus it is correct.

A football team carried out a report to see the impact of stretching on preventing injury. Of the 60 footballers in the squad 48 stretch regularly. Of those who stretch, 8 got injured last year. There was a total of 17 injured players last year.
The results can be presented in a frequency tree. What fraction of players who do stretch get injured?

Answers

Answer:

1 in every 6 players 1/6

8/48=1/6

Find the volume of the cylinder. Use 3.14 for pi.

HELP ME PLEASE !!!

Answers

Answer: 56.52

Step-by-step explanation:

V= 3.14(r)^2*h or numerically 3.14(3)^2*2 which equals 56.52

the answer is 56.52:):):):):):)):):):

x-5= -4
what is the answer for x?

Answers

Answer:

x = 1

Step-by-step explanation:

by solving the equation we get ;

x -5 = -4x = -4 + 5x = 1

Step-by-step explanation:

x = 1

hope it helps

Be happy and make happy

B is the midpoint of AC, AB = 3x + 7, and BC = 2x + 10. Find AB, BC, and AC.

PLEASE HELP

Answers

Answer:

Step-by-step explanation:

Pablo uses 12.5 cups of flour to make 5 batches of muffins. How many
cups of flour did he use per batch?

2.5 cups
25 cups
2 cups
65 cups

Answers

Answer:

2.5 cups

Step-by-step explanation:

12.5÷5=2.5 cups

hope that helped :)

is is 2.5 cups per batch

The Are the two Angles that are non-adjacent to the specified exteriors angle

Answers

The remote interior angles of a triangle are the two angles that are non-adjacent to the specified exterior angle.

Choose 3 answers
A. Obtuse triangle
B. Isosceles triangle
C. Acute triangle
D. Scalene triangle
E. Right triangle
F. Equilateral triangle
Help !

Answers

Answer:

C:Acute traingle

Acute traingle

I know this triangle is equilateral and acute, but I'm not sure what the third choice would be.

X/5+ 7 = y Solve for x
pls hurry

Answers

Answer:

x=5y-35

Step-by-step explanation:

If she would have left the money in the account for another nine months before with drawing how much interest would the account have earned

Answers

Use your head you learned it luv

Use the graph or table to write a linear function that relates y to x.
Determine whether the graph of the linear function is increasing,
decreasing, or constant.

Answers

Answer:

x=2

y=1

constant

Step-by-step explanation:

each function has a slope of 2

I hope X=2 y=1 hope this helps

Q. Three years ago, the population of a certain species of bird was calculated at 20 birds per acre
This year, a biologist recorded a total of 47 birds in an area equal to 3.25 acres. By about what
percentage has the bird population in the biologist's sample decreased over the last 3 years, to
the nearest tenth?
A. 14.7%
B. 27.7%
C. 38.3%
D. 42.6%
E. 72.3%

Answers

14.7 because you need to decide how many the second is per acre acre at first

Which of the following are terms in this expression? Select all that apply.
1 + 10n + m
5m
4n
10n
7

Answers

Answer:

10n is the only term

Step-by-step explanation:

because other numbers are not in the equation

Order the number from least to greatest -12, 3/25, -0.41

Answers

Answer:

-12, -0.41, 3/25

Step-by-step explanation:

Answer:

the answer is -12, -0.41, 3/25.

huan's wage is £10.40 per hour l. he receives a 10% pay rise ​

Answers

Answer:

Step-by-step explanation:

10% of 10.40=1.04

10.40+1.04=11.44

Identify the terms, variables, coefficients and constant..

Expression: 7+5c-2k-15

Terms:

Variables:

Coefficients:

Constants:

Answers

Answer:

Terms: 7, 5c, 2k, 15

Variables: C, K

Co efficients: 5, 2

Constants: 7, 15

I'll mark you as the brainiest if you get this correct
thx xxx

Answers

Answer:

Multiply 3

Step-by-step explanation:

For which value of m is start fraction 4 over 16 end frction equals start fraction m over 24 end fraction a proportion? A. m = 6 B. m = 8 C. m = 12 D. m = 14

Answers

Answer:

A. M=6

Step-by-step explanation:

Basically, this question is asking you to find m if 4/16 = m/24.

First, 4/16 can be simplified to 1/4. This will make it easier to solve.

You now have 1/4 = m/24.

Multiply both sides by 24 to get 24/4 = m.

Simplify to get m = 6.

10) What is the area of the figure below? Round your answer to the nearest tenth (1 place
value) if needed.

Answers

Answer:

Step-by-step explanation:

Divide the figure into a rectangle and a triangle.

area of rectangle = 5×10 = 50 square units

area of triangle = 0.5×5×10 = 25 square units

total area = 50+25 = 75 square units

There is a bag filled with 4 blue and 5 red marbles.
A marble is taken at random from the bag, the colour is noted and then it is replaced.
Another marble is taken at random.
What is the probability of getting 2 blues?

Answers

4/9 (4 out of 9) because you add them all together then count the number of blue marbles then since you put back the first marble, the dominator is still the same

algebraic expression the sum of 12 and k​

Answers

The answer is 12+k because sum means addition and it says 12 and k therefore you and 12 and k together and the algebraic expression would be 12+k
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