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
dimulka [17.4K]
3 years ago
12

Help if you understand please and thanks

Mathematics
1 answer:
wlad13 [49]3 years ago
6 0

Answer:

y = 4

Step-by-step explanation:

because 5 x 4 = 20 and 20 × 4 = 80 and so on y is equal to four

You might be interested in
#9 question Solve the equation. 0.6(y + 3) = 4.8
son4ous [18]
0.6 (y + 3) = 4.8
y+3 =4.8/0.6
 y + 3 = 8
 y = 8 - 3 = 5
 y = 5
6 0
3 years ago
Read 2 more answers
For the function f(x)=−x^2+x−7, find f(1)
tino4ka555 [31]

Answer:

f(1) = -7

Step-by-step explanation:

Step 1: Define

f(x) = -x² + x - 7

f(1) = x = 1

Step 2: Substitute and Evaluate

f(1) = -(1)² + 1 - 7

f(1) = -1 + 1 - 7

f(1) = -7

8 0
3 years ago
What is 8/10 subtract 5/10
anzhelika [568]
Since the denominators are the same, just subtract the numerators.
The answer is 3/10.
4 0
3 years ago
What is 1 2/25 as a decimal?
Elena-2011 [213]
Well, first of all, you have to change the mixed fraction to a proper fraction. So you have to multiply 25 by 1 and add the answer to 2, and use it as the numerator, with the denominator remaining the same. So;
27/25
   As a decimal, this fraction will be 1.08. Hope i helped. Have a nice day.
3 0
4 years ago
If sin θ = 2 over 7 and tan θ > 0, what is the value of cos θ?
sashaice [31]
\bf sin(\theta)=\cfrac{opposite}{hypotenuse}
\qquad
cos(\theta)=\cfrac{adjacent}{hypotenuse}
\quad 
% tangent
tan(\theta)=\cfrac{opposite}{adjacent}\\\\
-------------------------------\\\\

\bf sin(\theta )=\cfrac{2}{7}\cfrac{\leftarrow opposite}{\leftarrow hypotenuse}\qquad \textit{let's find the adjacent side}
\\\\\\
\textit{using the pythagorean theorem}\\\\
c^2=a^2+b^2\implies \pm\sqrt{c^2-b^2}=a\qquad 
\begin{cases}
c=hypotenuse\\
a=adjacent\\
b=opposite\\
\end{cases}
\\\\\\
\pm\sqrt{7^2-2^2}=a\implies \pm\sqrt{45}=a\implies \pm 3\sqrt{5}=a

but.... which is it? the + or the -? well, we know that  tan(θ) > 0, is another way to say that the tangent of the angle is positive, now, for the tangent to be positive, since it's opposite/adjacent both opposite and adjacent have to be the same exact sign, now, we know the opposite is +2, so that means the adjacent has to be the same sign, thus is the positive version 3√(5)

thus   \bf cos(\theta)=\cfrac{adjacent}{hypotenuse}\qquad \qquad cos(\theta )=\cfrac{3\sqrt{5}}{7}
3 0
4 years ago
Other questions:
  • Any One Know This One
    5·2 answers
  • Jacob bought 7 CDs. A week later half of all his CDs were destroyed in a fire. There are now only 23 CDs left. How many did he s
    6·2 answers
  • PLEASE WILL GIVE BRAINLIEST
    12·1 answer
  • Urgent help please! Answer any of the questions!
    10·1 answer
  • -5n+8= -7 in two-step equations-integers
    9·1 answer
  • HELP - 100 POINTS AND BRAINLIEST!! Find the area and volume - a square has a side length of 6.25 Please show your work! Thank yo
    11·2 answers
  • PLEASE HELP it’s so hard
    8·1 answer
  • Which equation represents "the sum of eight times a number and seven is twice the number"?
    6·2 answers
  • Find x.<br> (4x + 7)°<br> (2r + 5)°
    11·1 answer
  • 5x - 3(x - 5) = 13<br><br>what is x I don't understand how to get it.​
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!