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
JulijaS [17]
3 years ago
5

Let x=number of cds and y=number of dvds

Mathematics
1 answer:
Elis [28]3 years ago
6 0
X + y = 40.....multiply by -4
4x + 6y = 180
-------------------
-4x - 4y = -160 (result of multiplying by -4)
4x + 6y = 180
------------------add
2y = 20
y = 20/2
y = 10 <===

x = 30

You might be interested in
The amount of interest accrued on<br> a $7,000 loan with 6% interest after t years.
Misha Larkins [42]

Answer:

$420t

Step-by-step explanation:

Given data

Principal= $7000

Rate= 6%

Time= t years

The expression for the amount is

Simple interest= PRT/100

Sustitute

Simple interest= 7000*6*t/100

Simple interest= 42000t/100

Simple interest= 420t

Hence the amount after t years is $420t

6 0
3 years ago
Can someone please help me !!i really need this answer
Zarrin [17]
Yes they are congruent because they are reflecting on to each other
4 0
3 years ago
I need answers please
lakkis [162]

Answer: the first one

Step-by-step explanation:

It is the only one that is right

8 0
3 years ago
36 hundredths divided 9 tenths
valentina_108 [34]

Answer: 0.4

Step-by-step explanation:

5 0
3 years ago
How do you solve this? cosθ-tanθcosθ=0
laila [671]
First, lets note that tan(\theta)\cdot cos(\theta)=sin(\theta). This leads us with the following problem:

cos(\theta)-sin(\theta)=0

Lets add sin on both sides, and we get:

cos(\theta)=sin(\theta)

Now if we divide with sin on both sides we get:

\frac{cos(\theta)}{sin(\theta)}=1

Now we can remember how cot is defined, it is (cos/sin). So we have:

cot(\theta)=1

Now take the inverse of cot and we get:
\theta=cot^{-1}(1)=\pi\cdot n+ \frac{\pi}{4} , \quad n\in \mathbb{Z}

In general we have cot^{-1}(1)=\frac{\pi}{4}, the reason we have to add pi times n, is because it is a function that has multiple answers, see the picture:

4 0
3 years ago
Other questions:
  • What is 5(-3k+5)=-4K+k+1
    13·1 answer
  • 1. The distance in feet that Karina swims in a race is represented by 4d-4, where d is the distance for each lap. What is an exp
    12·1 answer
  • Mala is y years old her sister is 4 years older than mala write an expression in simplest form that repersents the sum of the ag
    6·1 answer
  • the ratio of 7th graders to 8th grader at a school dance is 3 to 2. there are 54 7th graders at a dance. how many 8th graders ar
    5·1 answer
  • -9c --12 +3c =12 what does c=
    12·1 answer
  • When 64 is added to the number that is produced by doubling the number x, the result is equal to 35 times the number that 1 less
    15·1 answer
  • 14w^9- 19w^9<br> Help please
    7·1 answer
  • I am a two digit number above 50. the sum of my digits is twelve and the difference of my digits is 4. who am I?​
    14·1 answer
  • Question 5 of 5 Which inequality is true? O A. 1 - 3 &gt; 1 O B. B. &gt; 1 O C. 97 &gt; 27 D. TI +7 &lt; 10 SUBMIT​
    11·1 answer
  • Solve these equations 27x + 14 =500. <br> 600= 12 + 14y
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!