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Lostsunrise [7]
4 years ago
5

O triplo de um mumero somado a 9 e igual a 30 .qual e esse numero

Mathematics
1 answer:
-Dominant- [34]4 years ago
7 0
Do you think than i ve understood it right 

3x+9=30

3x=21

x = 21/3 = 7

x = 7

hope helped 
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How do you write a inequality for the ticket is at most $10
dimaraw [331]

x>$ 10

I'm not sure though...

5 0
4 years ago
Mark counts six ducks in a pond and some ducks on the grass. There are ducks all l4. Draw a picture to show the two groups of du
murzikaleks [220]
So 6 in pond
some on grass
# in pond+# in grass=14
6 in pond
subsitute 6 for pond
6+# in greass=14
subtract 6 from both sides
6-6+# in grass=14-6
0+# in grass=8
# in grass=8
there are 8 ducks in grass

so you would draw a circle for the pond and put 6 circles in there to represent the ducks, then , outside of that big circle, draw 8 circles to represent the 8 ducks on the grass (maybe label the big circle as pond and outside as grass)
6 0
3 years ago
Rounding and Estimating Whole Numbers explain what is it and what to do
Kay [80]
Rounding numbers means you change the number to a closer, easier number. For example if you want to round 56 to the nearest tenth, it would round to 60.
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I hope this helped:))
5 0
3 years ago
A survey claims that the percent of an entire population that agrees with redeveloping the city park is likely between 49.1% and
kumpel [21]

Answer:

<u>567</u> people were surveyed.

Step-by-step explanation:

Given:

A survey claims that the percent of an entire population that agrees with redeveloping the city park is likely between 49.1% and 57.5%.

Now, to find total people who were surveyed.

<em>According to survey percent of population agrees between = 49.1% to 57.5%.</em>

So, we need to find the error of margin:

\frac{57.5\%-49.1\%}{2}

=\frac{8.4\%}{2}

=4.2\%.

Let the number of people surveyed be n.

Now, to get the number of people surveyed:

4.2\%=\frac{1}{\sqrt{n} }

\frac{4.2}{100}=\frac{1}{\sqrt{n} }

0.042=\frac{1}{\sqrt{n} }

<em>By cross multiplying we get:</em>

<em />\sqrt{n}=\frac{1}{0.042}<em />

<em />\sqrt{n}=23.81<em />

<em>Using square root on both sides we get:</em>

n=566.91.

<u>Approximately:</u>

<u />n=567.<u />

Therefore, 567 people were surveyed.

7 0
3 years ago
Please help me!!!!!!!!!!
Vladimir79 [104]
I think it's 11 (or 11.1) because it gave you 500 as the total and it increases by 45 every year (45x).

45x=500

45x÷45=x

500÷45=11 (rounded instead of 11.11111.....)
7 0
3 years ago
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