1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Yuliya22 [10]
3 years ago
15

Can I have some help

Mathematics
1 answer:
Brums [2.3K]3 years ago
6 0

\frac{100}{40}  =  \frac{z + 69}{z}  \\ 100z = 40z  + 2760 \\ 60z = 2760 \\ z = 46
You might be interested in
Solve the quadratic equations
Alexxx [7]

Answer:

for quadratic equation 1

y^2-10y+21=0

Step-by-step explanation:

y^2-7y-3y+21=0

y(y-7)-3(y-7)=0

(y-7)(y-3)=0

y-7=0,y-3=0

y=7,y=3

y=(3,7)

for quadratic equation 2

16p^2-8p+1=0

16p^2-4p-4p+1=0

4p(4p-1)-1(4p-1)=0

(4p-1)twice=0

4p-1=0,4p-1=0

4p=1

p=1/4 twice

for quadratic equation 3

x^2-400=0

x^2=400

x=√400

x=20

for quadratic equation 4

-16m^2-8m-1=0

multiply the equation by -

16m^2+8m+1=0

16m^2+4m+4m+1=0

4m(4m+1)1(4m+1)=0

4m+1=0 twice

m=-1/4 twice

for quadratic equation 5

-3n^2+75=0

divide both side by -3

-3n^2/-3=-75/-3

n^2=25

n=√25

n=5

6 0
2 years ago
1-58. Mr. Wright was making a table to figure out how much it costs to send a certain numt
Drupady [299]

A table of values can be used to represent variables that are directly proportional.

The complete table of proportions is:

\left[\begin{array}{ccccccccc}Letters&10&2&[150 ]&7&1&500&[420] \\Cost&0.45&0.90&6.75&[0.315]&[0.045 ]&[22.5 ] & 18.90\end{array}\right]

Given that

\left[\begin{array}{ccccccccc}Letters&10&2&[\ ]&7&1&500&[\ ] \\Cost&0.45&0.90&6.75&[\ ]&[\ ]&[\ ] & 18.90\end{array}\right]

Let:

<em />L \to<em> Letters</em>

<em />C \to<em> Cost</em>

<em />

Using proportional reasoning, we have:

C  = kL

Where

<em />k \to<em> ratio of proportion</em>

For the first values of C and L, we have:

C  = kL

0.45 = k \times 10

Divide both sides by 10

k = 0.045

So, the equation of proportion is:

C = 0.045L

<u>When C = 6.75, we have:</u>

C = 0.045L

6.75 = 0.045L

Solve for L

L = \frac{6.75}{0.045}

L = 150

<u>When L = 7, we have:</u>

C = 0.045L

C = 0.045 \times 7

C = 0.315

<u>When L = 1, we have:</u>

C = 0.045L

C = 0.045 \times 1

C = 0.045

<u>When L = 500, we have:</u>

C =0.045L\\

C =0.045 \times 500

C =22.5

<u>When C = 18.90, we have:</u>

C = 0.045L

18.90 = 0.045L

Solve for L

L=\frac{18.90}{0.045}

L=420

Hence, the complete table is:

\left[\begin{array}{ccccccccc}Letters&10&2&[150 ]&7&1&500&[420] \\Cost&0.45&0.90&6.75&[0.315]&[0.045 ]&[22.5 ] & 18.90\end{array}\right]

Read more about proportions at:

brainly.com/question/21126582

8 0
2 years ago
For the data set below, which of the following are true? {12, 18, 28, 14, 18, 20, 12}
iragen [17]
Alright bud the best answer to this question will be that the mode is 12 because it appears the most
6 0
3 years ago
Read 2 more answers
*30 POINTS* HELP FOR BRAINLIEST
Marta_Voda [28]

Answer:

21

Step-by-step explanation:

f(x) =x^2 - 6x + 21

f(xl =0

Answer:

substitute 0 for x

f(0) = 0^2 - 6(0) + 21

0. = 0 - 0 + 21

0. = 21

6 0
3 years ago
I need this two questions
Setler79 [48]

Just solve.

(17-k)^3\\k=12 \\ \\ (17-12)^3 \\ \\ (5)^3 \\ \\ 125\\

\\\\(5+2n)^5 \\ n=-2 \\ \\ (5+2(-2))^5 \\ \\ (5-4)^5 \\ \\ (1)^5 \\ \\ 1

4 0
3 years ago
Other questions:
  • 8. By area, the former U.S.S.R. was the largest country, having 8.649x106 square miles of land. At this time Canada was the seco
    8·1 answer
  • Find the circumference of the following circle. Use 3.14 for π. Round to the nearest hundredth
    9·2 answers
  • Please explain thoroughly.
    5·1 answer
  • Two mechanics worked on a car. The first mechanic worked for
    11·2 answers
  • Can someone help please
    7·1 answer
  • Karen and Ann share the cost of a DVD that costs $29.90
    15·1 answer
  • The longest side of an acute isosceles triangle is 12 centimeters, Rounded to the nearest tenth, what is the
    12·1 answer
  • 1.<br> What is the area of this tile?<br> ina<br> 6 in.<br> 2 in.
    14·2 answers
  • aley took her science test and got 35 correct and 5 incorrect answers. What was the percentage of correct answers?
    7·1 answer
  • Write a cosine function that Has a midline of 2 an amplitude of 3 and a period of 7pi/4
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!