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
Cerrena [4.2K]
3 years ago
5

Can anyone help me with these?

Mathematics
1 answer:
katrin2010 [14]3 years ago
6 0

Answer:

Step-by-step explanation:

Distributive property: a*(b + c)  = ab + ac

16)5x²(7 - x²) = 5x²*7 - 5x²*x²

                   =35x² - 5x⁴

17)

10x(4 - 3x) = 10x*4 - 10x*3x

                  = 40x - 30x²

18) 9( y +4) = 9*y + 9*4

                 = 9y + 36

19) 3(4 - x) - 3(2 - x) = 3*4 - 3*x -3*2 - x*(-3)

                                = 12 - 3x - 6  + 3x  {add/subtract like terms}

                                = 12 - 6 - 3x + 3x

                                = 6

20) 6y + 6(y - 4) = 6y + 6*y - 6*4

                          = 6y + 6y - 24

                          = 12y - 24

                         

You might be interested in
Put the fraction in least to greatest 1/5, 5/5 ,4/5
konstantin123 [22]

Answer:

1/5, 4/5, 5/5

Step-by-step explanation:

1/5 is 20%

4/5 is 80%

5/5 is 100%

8 0
3 years ago
Read 2 more answers
Whats the answer to: 3x + 5y = 2 9x + 11y = 14
valkas [14]

\begin{gathered}\{\begin{array}{ccc}3x+5y=2&|\cdot(-3)\\9x+11y=14\end{array}\\\underline{+\{\begin{array}{ccc}-9x-15y=-6\\9x+11y=14\end{array}}\ \ |\text{add both sides of equations}\\.\ \ \ \ \ -4y=8\ \ \ |:(=4)\\.\ \ \ \ \ y=-2\\\\\text{substitute the value of y to the first equation}\\\\3x+5\cdot(-2)=2\\3x-10=2\ \ \ |+10\\3x=12\ \ \ |:3\\x=4\\\\Answer:\ x=4;\ y=-2\to(4;\ -2)\end{gathered}

{

3x+5y=2

9x+11y=14

∣⋅(−3)

−9x−15y=−6

9x+11y=14

add both sides of equations

. −4y=8 ∣:(=4)

. y=−2

substitute the value of y to the first equation

3x+5⋅(−2)=2

3x−10=2 ∣+10

3x=12 ∣:3

x=4

Answer: x=4; y=−2→(4; −2)

5 0
3 years ago
Help plssss!!! Giving. 10 pointsssssss
gayaneshka [121]

Answer:

its 34

Step-by-step explanation:

8 0
3 years ago
Which expressions are equivalent to -56z + 28.
NeX [460]

Answer:

B and C

Step-by-step explanation:

(-7)•8z = -56z

(-4)•(-7)=28

and

40•(-1.4)= -56z

40•0.7= 28

5 0
3 years ago
At the beginning of an environmental study, a forest covered an area of 1500 km. Since then, this area has decreased by 7.25% ea
WITCHER [35]

\qquad \textit{Amount for Exponential Decay} \\\\ y=P(1 - r)^t\qquad \begin{cases} y=\textit{current amount}\\ P=\textit{initial amount}\dotfill &1500\\ r=rate\to 7.25\%\to \frac{7.25}{100}\dotfill &0.0725\\ t=\textit{elapsed time}\dotfill &t\\ \end{cases} \\\\\\ y=1500(1-0.0725)^t\implies y=1500(0.9275)^t

5 0
2 years ago
Other questions:
  • The sum of 4 times a number and 7 is 19
    11·2 answers
  • When it was 70 degrees outside, 50 members showed up at a beach club. For each degree the temperature rose, another 10 members c
    10·1 answer
  • Michael is an avid reader, his generous grandparents gave him money for his birthday, and he decided to spend at most $150 on bo
    5·1 answer
  • PLEASE FAST 40 POINTS
    15·2 answers
  • A coin is flipped 10 times. The coin lands on HEADS 7 times. Write the values fraction and percent form.
    7·1 answer
  • How many miles are in 19.08 kilometers?
    14·2 answers
  • In a class of students, the following data table summarizes how many students play an instrument or a sport. What is the probabi
    11·1 answer
  • -
    12·1 answer
  • Find the Surface Area of the prism please
    5·1 answer
  • Answer the questions below about Line 1 and Line 2 shown below.
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!