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3 years ago

Estimate first..then give the exact sum 72.13 + 33.14=?

Mathematics

2 answers:

Varvara68 [4.7K]3 years ago

7 0

Answer:

Estimation

72+33

= 105

Exact sum

72.13+33.14

= 105.27

Can i please get brainliest answer?

Lera25 [3.4K]3 years ago

6 0

Answer:

exact sum is 105.27,,,

Step-by-step explanation:

that is after adding you gate the exact sum,,estimation is just measuring or by a look with an eye,,or just summating using the eyes without getting the actual answer,, estimation is 105

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Fill in the blank 2(x+7) = 2x + __

natka813 [3]

Answer:

Step-by-step explanation

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3 years ago

An old campfire is uncovered during an archaeological dig. Its charcoal is found to contain less than 1/1000 the normal amount o

Lubov Fominskaja [6]

An old campfire is uncovered during an archaeological dig. Its charcoal is found to contain less than 1/1000 the normal amount of $^{14}\text{C}$ . Estimate the minimum age of the charcoal, noting that $2^{10} = 1024$

Answer:

57300 years

Step-by-step explanation:

Using the relation of an half-life time in relation to fraction which can be expressed as:

$\dfrac{N}{N_o} = (\dfrac{1}{2})^{\frac{t}{t_{1/2}}$

here;

N represents the present atom

$N_o$ represents the initial atom

t represents the time

$t_{1/2}$ represents the half - life

Given that:

Its charcoal is found to contain less than 1/1000 the normal amount of $^{14}\text{C}$ .

Then ;

$\dfrac{N}{N_o} = \dfrac{1}{1000}$

However; we are to estimate the minimum age of the charcoal, noting that $2^{10} = 1024$

so noting that $2^{10} = 1024$ , then:

$\dfrac{1}{1000}> \dfrac{1}{1024}$

$\dfrac{1}{1000}> \dfrac{1}{2^{10}}$

$\dfrac{1}{1000}> (\dfrac{1}{2})^{10}$

$\dfrac{N}{N_o} = \dfrac{1}{1000}$

Then

$\dfrac{N}{N_o} > (\dfrac{1}{2})^{10}$

Therefore, the estimate of the minimum time needed is 10 half-life time.

For $^{14}\text{C}$ , the normal half-life time = 5730 years

As such , the estimate of the minimum age of the charcoal = 5730 years × 10

= 57300 years

5 0

3 years ago

Simplify -4 + (-3) + 6

Sedaia [141]

Start off with: -4 + (-3) + 6

First of all, when there is a, + sign and a - sign next to each other, the - side wins. E.g. 1 +- 3 = 1 - 3

So, apply this to our one:
-4 -3 +6

From there you solve, you can do this using the number line method or whatever you are into:
=-7 + 6
=-1
The answer is -1

3 0

3 years ago

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Paladinen [302]

All the angles inside a triangle add up to 180°.

(2x + 15) + (5x + 5) + x = 180
8x + 20 = 180
8x = 180 - 20
8x = 160
x = 160/8
x = 20
the question is asking what angle B is,
B = 2(20) + 15
B = 40 + 15
B = 55°

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3 years ago

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3 years ago

Estimate first..then give the exact sum 72.13 + 33.14=?​

Estimate first..then give the exact sum 72.13 + 33.14=?