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den301095 [7]
3 years ago
5

Jeany bought 12 postcards which was twice as many postcards as joe bought. Ruth bought 3 times as many postcards as joe. How man

y postcards did they buy together?
Mathematics
2 answers:
nasty-shy [4]3 years ago
8 0

Answer:36 postcards

Step-by-step explanation:

jenny bought 12 post cards

joe bought half of the postcards jenny bought = 12/2 = 6

ruth bought 3 times the postcards joe bought = 3 x 6 = 18

total postcards bought by all = 12 + 6 + 18 = 36 postcards

Ludmilka [50]3 years ago
6 0

Answer: they bought 36 postcards.

Step-by-step explanation:

Jeany bought 12 postcards which was twice as many postcards as joe bought. It means that the number of postcards that Joe bought is

112/2 = 6 postcards

Ruth bought 3 times as many postcards as joe. It means that the number of postcards that Ruth bought is

3 × 6 = 18 postcards

Therefore, the number of postcards that they bought together would be

12 + 6 + 18 = 36 postcards

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What is the value of 5k + m when k = -3 and m = -<br> -9?<br> A. -60<br> B. -30<br> C.-24<br> D. -6
sladkih [1.3K]

Answer:

C. -24

Step-by-step explanation:

5k + m \\ k =  - 3 \\ m =  - 9

Plug in values into the given equation

5( - 3) + ( - 9) \\  - 15 - 9 \\  =  - 24

6 0
3 years ago
The length of the diogonals of a rectangular garden is 34m. If it's longer side measures 30m, find the perimeter of garden. ​
MakcuM [25]

Answer:

92 m

Step-by-step explanation:

Use the Pythagorean theorem to find the length of the shorter side.

Let w = length of the shorter side.

w^{2}  + 30^{2}  =  34^{2} \\ w^{2}  + 900 = 1156\\w^{2}  =  256\\w = \sqrt{256} = 16

The perimeter is 2l + 2w = 2(30) + 2(16) = 60 + 32 = 92 m

6 0
2 years ago
If it takes you 40 minutes to go 20 miles downstream and then 60 minutes on the way back, what is the speed of the current?
IrinaK [193]

Answer:

Speed of Current = 5 miles per hour

Step-by-step explanation:

We know distance formula,

D = RT

Where

D is distance

R is rate

T is time

If we let speed of boat (assume) to be "x" and speed of current to be "c"

Then downstream rate is (with current) = x + c

Upstream rate is (against current) = x - c

40 mins to go 20 miles downstream, that means:

D = RT

20 = (x + c)(40)

and

60 minutes to go upstream, 20 miles, that means:

D = RT

20 = (x - c)(60)

Simplifying first equation:

40x + 40c = 20

Simplifying second equation:

60x - 60c = 20

Multiplying first equation by 60, we get:

60 * [40x + 40c = 20] = 2400x + 2400c = 1200

Multiplying second equation by 40, we get:

40 * [60x - 60c = 20] = 2400x - 2400c = 800

Now we add up both these equations:

2400x + 2400c = 1200

2400x - 2400c = 800

----------------------------------

4800x = 2000

x = 2000/4800 = 5/12

We need speed of current, that is "c", so we plug in the value of x into first equation and solve for c:

40x + 40c = 20\\40(\frac{5}{12}) + 40c = 20\\\frac{50}{3}+40c=20\\40c=20-\frac{50}{3}\\40c=\frac{10}{3}\\c=\frac{1}{12}

Speed of Current = 1/12 miles per minute

Since there is 60 minutes in an hours, that would be:

(1/12) * 60 = 5 miles per hour

Speed of Current = 5 miles per hour

3 0
3 years ago
I NEED HELP PLEASEE
xenn [34]

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5 0
3 years ago
Answer? please help :))
gtnhenbr [62]

Answer:

(0,1)(4,9)

Step-by-step explanation:

8 0
3 years ago
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