By rounding to 1 significant figure, estimate 392.72 ÷ 8.44

Mathematics

2 answers:

kumpel [21]3 years ago

8 0

Answer:

0.3972 this is a answer of questions

oksian1 [2.3K]3 years ago

6 0

Answer:

Step-by-step explanation:

Rounding 392.72 ≈ 400 ( to 1 significant figure )

Rounding 8.44 ≈ 8 ( to 1 significant figure )

Then

400 ÷ 8 = 50

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The sum of two numbers is 70 and their difference is 30. Find the two numbers

ikadub [295]

Answer:

Our two numbers are 50 and 20

Step-by-step explanation:

Sum means add together

Difference means subtract each other

x + y = 70

x - y = 30

subtract from each other

2x = 100

divide both sides by 2

x = 50

our first number is 50

50 + y = 70

subtract both sides by 50

y = 20

Our two numbers are 50 and 20

8 0

3 years ago

The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain after 1000 years?

adell [148]

Answer: 129.33 g

Step-by-step explanation:

$$$Let $p=A \cdot e^{n t}$ \\$(p=$ present amount, $A=$ initial amount, $n=$ decay rate, $t=$ time)$

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