All categories

4 years ago

2. Twice a certain number is doubled. The resulting number is four times the original number.

Mathematics

1 answer:

Anna35 [415]4 years ago

8 0

2(2x)=4x
duh
4x=4x
x=x
true,
all real numbers are solutions

You might be interested in

7(C - 18)= -98<br> Help ASAP

Harlamova29_29 [7]

Answer:

$C=4$

Step-by-step explanation:

$7(c-18)=-98\\7c \frac{-126}{+126}=\frac{-98}{+126} \\\frac{7c}{7}=\frac{28}{7}\\c=4$

3 0

3 years ago

A concession stand sells hamburgers (h) for $2 and hotdogs(d) for $1.On friday night they sold a total of 300 hamburgers and hot

Olegator [25]

The first equation has to be the sum of hotdogs and hamburgers. Since a total of 300 <span>hamburgers and hotdogs was sold, the first equation is:
h+d=300

Now, the second equation is about the money. They say that EACH hamburger cost $2 and each hotdog cost $1. And, the total amount of money made was $420. So the second equation is:

2h+d=420

SO, overall, the system of equations is this:

h+d=300
2h+d=420

(option A is the answer)</span>

8 0

4 years ago

The work of a student to solve a set of equations is shown:

anzhelika [568]

That would be step 2.

step 1 is correct....multiplying the first equation by -6 which gives you :
-6y = -24 + 12z
but in step 2, the simplifying would be : y = 4 - 2z

6 0

3 years ago

Maggie was thinking of a number. If she multiply the number by 3 ,subtracted by 8 ,added by 2 times the 5 original number . the

Fiesta28 [93]

I hope this helps you

number is ?

3.?-8+2.5.?=48

13.?=56

?=56/13

6 0

3 years ago

Tabitha decided to start saving pennies for a stretch of two months and initially started with 2 pennies. A table showing the nu

svetoff [14.1K]

Answer:

after week 7: 4374 pennies
486 pennies: after week 5

Step-by-step explanation:

The sequence values have a first term of 6 and a common ratio of 3, so can be described by the formula ...

an = 6·3^(n-1)

This can be rearranged to ...

an = 2·3^n

When n=7, the value is ...

a7 = 2·3^7 = 4374 . . . . pennies saved after 7 weeks

To find when there are 486 pennies saved, we can solve the equation ...

486 = 2·3^n

243 = 3^n

log(243) = n·log(3) . . . . . . . take the logarithm

log(243)/log(3) = n = 5 . . . . divide by the coefficient of n

Tabitha will have saved 486 pennies after 5 weeks.

7 0

3 years ago