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
uranmaximum [27]
3 years ago
13

Cedric and Zelda went shopping at Price buster buster Cedric Bought to jumbo rolls of aluminum foil and three packages of AA bat

teries for a total cost of $21 Zelda Bought 5 identical jumbo rolls of aluminum foil and two identical packages of AA batteries for a total cost of $25 find the cost of one roll of aluminum foil and find the cost of one package of AA batteries
Mathematics
1 answer:
Lera25 [3.4K]3 years ago
3 0
Let f and b be the cost of foil and batteries respectively.  We are first given that:

2f+3b=21  subtract 3b from both sides

2f=21-3b  divide both sides by 2

f=(21-3b)/2

Then we are given:

5f+2b=25, using f found above in this equation gives you:

5(21-3b)/2+2b=25

(5(21-3b)+4b)/2=25  multiply both sides by 2

5(21-3b)+4b=50  carry out indicated operations on left side

105-15b+4b=50 combine like terms on left side

105-11b=50  subtract 105 from both sides

-11b=-55  divide both sides by -11

b=5, since f=(21-3b)/2

f=(21-3*5)/2

f=3

So batteries cost $5 and foil cost $3.
You might be interested in
grandma gigi gave leyla a rare purple stone for her sweet 16 birthday. at that time,the stone was worth$245. it has been increas
sergij07 [2.7K]
This is a compound interest problem, therefore s(t) should be in the form:
s(t) = a(r)^{t}

where: 
t = time in years
s(t) = the value of your item after t years
a = the initial value of your item
r = rate

Therefore, we already know that a = 245$.

Now, we can calculate r:
r^{t}=\frac{s}{a}
r =  \sqrt[t]{ \frac{s}{a} }
r = \sqrt[5]{ \frac{560.50}{245} }
     = 1.18

Therefore, the correct answers are a = 245 and r = 1.18

4 0
3 years ago
I need to pass so yk help​
Airida [17]

Answer:

(2)

Step-by-step explanation:

-3,2

-1,-1

y = ax + b \\ 2 =  - 3a + b \\  - 1 =  - a + b \\ 3 =  - 2a \\ a =  - 1.5

slope is -1.5

3 0
3 years ago
Describe the relationship between two variables when the correlation coefficient r is one of the following.(a) near –1weak or no
AlexFokin [52]

Step-by-step explanation:

I don't know this math yet

sorry

7 0
3 years ago
Two paths each of width 4m run across the middle of a rectangular field 24m long and 16m wide. Calculate the area of the paths.​
djverab [1.8K]

Answer:

272cm2

Step-by-step explanation:

4m×2=8

width ×long=area

8m×24m=272cm2

7 0
3 years ago
The principal P is borrowed at a simple interest rate are for a period of time T. Find the loans future value A, or the total am
Xelga [282]

Answer:

The total amount due after five years is $57,000.

Step-by-step explanation:

Recall that simple interest is given by the formula:

\displaystyle A=P(1+rt)

Where <em>A</em> is the final amount, <em>P</em> is the principal amount, <em>r</em> is the rate, and <em>t</em> is the time (in years).

Since we are investing a principal amount of $38,000 at a rate of 10.0% for five years, <em>P</em> = 38000, <em>r</em> = 0.1, and <em>t</em> = 5. Substitute:

\displaystyle A=38000(1+(0.1)(5))

Evaluate. Hence:

\displaystyle A=\$ 57,000

The total amount due after five years is $57,000.

4 0
3 years ago
Other questions:
  • The number of flaws in a fiber optic cable follows a Poisson distribution. It is known that the mean number of flaws in 50m of c
    13·1 answer
  • I really need help with these please
    13·2 answers
  • WHEN gEORGE AND aNTHEA WERE MARRIED 120 OF THE GUEST aNTHEA'S FAMILY OR FRIENDS. THIS WAS 60 PERCENT OF THE TOTAL number of gues
    6·1 answer
  • What measurement do you use for surface area
    8·1 answer
  • attention people of brainly their are a bunch of fraudulent accounts saying they put the answers on a file hosting (cutt) and to
    7·2 answers
  • I GIVEEEEE BRAINLILSTTTTT
    7·2 answers
  • Question is below ( explanation)
    13·1 answer
  • 2. You are rolling a number cube. What is the probability that you will roll a
    13·1 answer
  • Find the LCM of 6 and 8 and list the multiples <br>​
    13·1 answer
  • What is the circumference of quadrilateral ABED in cm?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!