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Anni [7]
3 years ago
7

Arianna bought 16 postcards during 4 days of vacation. How many days will Arianna have to spend on vacation before she will have

bought a total of 20 postcards? Assume the relationship is directly proportional
Mathematics
1 answer:
Stels [109]3 years ago
5 0

Answer:5 days

Step-by-step explanation:

16 divided by 4=4 postcards a day

20 divided by 4=5

5 days in total

hope this helps . Please mark brainliest

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What are two expressions that are equivalent to 2(x+4)
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2x + 8

(x + 8) / 2 (brainliest?)

Step-by-step explanation:

6 0
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Simplify. Y/3 + 1/y^2/9 - 1
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Hope this is understandable.

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Any one have the rest of the Surface Area and Volume Unit Test ??? please !!
kotykmax [81]

Answer:

Second option is the right choice.

Step-by-step explanation:

Volume=2\pi rh+2\pi r^2\\\\V=2\left(3.14\right)\left(13\right)\left(14\right)+2\left(3.14\right)\left(13\right)^2\\\\\approx2205\:in^2

4 0
2 years ago
the sum of the first six terms of a geometric series is 21/16 . if the common ratio is -1/2 , what is the first term?
Oksanka [162]

Answer:

-84

Step-by-step explanation:

The formula for the nth term of a geometric progression is

Un = ar^n- 1

The sum of the first six terms of a geometric series (U6) = 21/16

Common ratio = -1/2 ,

a = First term ??

21/16 = a × (-1/2 )^6- 1

21/16 = a ×(-2^-1)^5

21/16 = a × -2^-6

Cross Multiply

16 × a × -2^-6 = 21

a = 21/16 × -2^-6

a = 21/16 ×- 1/2⁶

a = 21/16 × -1/64

a = 21 ÷(-1/4)

a = 21 × -4

a = -84

The first term = 84

8 0
2 years ago
On a certain hot​ summer's day, 645 people used the public swimming pool. The daily prices are $1.75 for children and $2.50 for
VladimirAG [237]

Answer:

327 children and 318 adults

Step-by-step explanation:

The x be the amount of children and y be the amount of adults that were at the swimming pool. We can use this to set up a system of equations:

x+y=645

1.75x+2.50y=1367.25

Move y to the other side in the first equation to isolate x and solve the system using substitution:

x=645-y

  1.75(645-y)+2.50y=1367.25

Distribute

1128.75-1.75y+2.50y=1367.25

         1128.75+0.75y=1367.25

Subtract 1128.75 from both sides

                        0.75y=238.5

Divide both sides by 0.75

                                y=318

x=645-y

x=645-318

x=327

327 children and 318 adults swam at the pool that day

4 0
2 years ago
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