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3 years ago

The sum of twice a number and seven is 13. Find the number.

Mathematics

1 answer:

Furkat [3]3 years ago

3 0

Answer:

<h2>The answer is 3</h2>

Step-by-step explanation:

Let the number be x

The statement

twice a number is written as

The sum of twice a number and seven is written as

2x + 7

The result is 13

So we have

2x + 7 = 13

Subtract 7 from both sides

That's

2x + 7 - 7 = 13 - 7

2x = 6

Divide both sides by 2

That's

$\frac{2x}{2} = \frac{6}{2}$

We have the final answer as

Hope this helps you

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A study was conducted to compare the overall length of two species of lake trout, labeled A and B. Ten fish from each species we

Fofino [41]

Answer:

Step-by-step explanation:

Given that Ten fish from each species were randomly selected from each of three lakes and their respective lengths were recorded

a) Experimental unit is the length of two species of fish of lake trout.

b) Population is the set of all species in the lake

c) Sample is the twenty taken for testing

d) Response variable is the length of the fish

e) This is an observational study as already existing is recorded without any external control to change.

6 0

2 years ago

What is the ratio of 420m to 1 km

suter [353]

Answer:

21/50 or 21:50

Step-by-step explanation:

1km = 1000m

That means one meter is equal to 1/1000 of a km.

420 meters is 420/1000 of a km which is equal to 42/100 = 21/50 or 21:50

Is it right?

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7 0

3 years ago

Read 2 more answers

PLS HELP ME!! this test will bring my grade up ahhh (question in picture(

weqwewe [10]

Answer:

A or D

Step-by-step explanation:

You know that triangles are Similar if they have like same angles. If too triangles are the same the 3rd one has to be too!

Hope this helped and I hope you do well on your test!! Good Luck!

*Sends good vibes* :)) <33

"You were born to be real, Not perfect.."

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4 0

3 years ago

Marta bought new fish for her home aquarium. She bought 3 guppies and 2 platies for a total of $13.95. Hank also bought guppies

ratelena [41]

Hank bought same guppies as Marta but 2more platies so
18.33-13.95=4.38
2platies=4.38
4.38/2=2.19
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3 0

3 years ago

Consider Z1= 4-4 radical 3i and Z2= -16 i. What is Z1-Z2?

goldfiish [28.3K]

Answer:

Option (3)

Step-by-step explanation:

$Z_1=4-4\sqrt{3}i$

$Z_2=-16i$

$Z_1-Z_2=(4-4\sqrt{3}i)-(-16i)$

$=4-4\sqrt{3}i+16i$

$=4-(4\sqrt{3}i-16i)$

$=4-4(\sqrt{3}-4)i$

Therefore, Option (3) will be the correct option.

8 0

2 years ago