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trasher [3.6K]
2 years ago
13

1 Devin brings 7 dolls to her grandma's house. These dolls represent 20% of Devin's doll collection. What is the total number of

dolls in Anita's doll collection? Show vour answer by doing a double number line or a table.
Mathematics
1 answer:
wel2 years ago
4 0

Answer:

35

Step-by-step explanation:

20% * x = 7

20/100 * x= 7

x = 7 *100/20  (7*100÷20)

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Find the area of the blue sector of the circle. Round to the nearest hundredth.
Varvara68 [4.7K]
A diagram must be associated with the question above. Based on what I researched, this is what I got.

The blue sector of the circle is 120 degrees.

area of the blue sector = 1/3  of pi * 2^2
                                     = 4.19cm2

I hope this answer helps.
8 0
3 years ago
What is the sum of the geometric series 2+6+18+...+486?
marin [14]

Answer:

728

Step-by-step explanation:

2+6+18+...+486

a=2

r=6/2=3

a_{n}=ar^{n-1}\\486=2(3)^{n-1}\\3^{n-1}=486/2=243=3^5\\n-1=5\\n=5+1=6\\S_{6}=2\frac{3^6-1}{3-1} \\=2\frac{729-1}{2}\\=728

6 0
3 years ago
How you solve this by using solving proportions
DerKrebs [107]

3/(x + 4) = (x + 2)/5

Multiply both sides by 5 :

5 × 3/(x + 4) = 5 × (x + 2)/5

15/(x + 4) = x + 2

Multiply both sides by x + 4 :

(x + 4) × 15/(x + 4) = (x + 4) × (x + 2)

Provided that x + 4 ≠ 0, we can cancel the factors of x + 4 on the left side:

15 = (x + 4) (x + 2)

Expand the product on the right side:

15 = x² + 6x + 8

Move everything to one side:

0 = x² + 6x - 7

We can factorize easily in this case
0 = (x + 7) (x - 1)

Then

x + 7 = 0   or   x - 1 = 0

⇒   x = -7   or   x = 1

7 0
2 years ago
Began with a temperature of -10 and ended after 8 minutes at a temperature of 0 which graph represents same relationship between
Alexus [3.1K]
Answer: The temperature, y, increases 5/4 or 1.25 degrees per minute, x.


(0,-10) (8,0)

use y1-y2/x1-x2 to find the slope

-10-0/0-8

= -10/-8

= 5/4
6 0
2 years ago
Solve for the missing side of the triangle
mixas84 [53]

sin53=x/15

0.798×15=x

x=11.98is your answer

7 0
3 years ago
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