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4 years ago

Which of these is the best reason to carry out scientific research on environmental issues?

Mathematics

1 answer:

julia-pushkina [17]4 years ago

4 0

Answer:

The correct option is B) To help people prepare for the future.

Step-by-step explanation:

The other three options are irrelevant to scientific research on environment .

Hence the correct option is B)

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The product of 3 and a number is 39

Ivahew [28]

Answer:

Algebraic expression ; 3x = 39

Step-by-step explanation:

Let the unknown number be x

$3\times x = 39\\\\3x = 39$

Further solving

$\mathrm{Divide\:both\:sides\:by\:}3\\\\\frac{3x}{3}=\frac{39}{3}\\\\Simplify\\\\x =13$

7 0

3 years ago

Read 2 more answers

Is it true that the integral LaTeX: \int x^2e^{2x}dx ∫ x 2 e 2 x d x can be evaluated using integration by parts? If so, state t

Marysya12 [62]

Answer:

Yes the integral can be evaluated by integration by parts as solved below.

Step-by-step explanation:

$\int x^{2}e^{2x}dx$

Taking algebraic function as first function and exponential function as second function we have

$\int x^{2}e^{2x}dx=x^{2}\int e^{2x}dx-\int (x^{2})'\int e^{2x}dx\\\\=x^{2}\frac{e^{2x}}{2}-\int 2x\times \frac{e^{2x}}{2}dx\\\\\frac{x^{2}e^{2x}}{2}-\int xe^{2x}dx\\\\Now\\\\\int xe^{2x}dx=x\int e^{2x}dx-\int 1\cdot \int e^{2x}dx\\\\=\frac{xe^{2x}}{2}-\int \frac{e^{2x}}{2}dx\\\\\frac{xe^{2x}}{2}-\frac{e^{2x}}{4}\\\\\therefore \int x^{2}e^{2x}dx=\frac{x^{2}e^{2x}}{2}-\frac{xe^{2x}}{2}+\frac{e^{2x}}{4}$

5 0

3 years ago

Sue wants to use mental math to find 7x53 write an expresión she Could use

asambeis [7]

371 is the answer you welcome

8 0

3 years ago

Suppose we lined up all the people in the world (about 7.4 billion people). Assume that each person occupied 13 inches of the li

finlep [7]

Answer:

The answer to your question is: # of times = 60.7

Step-by-step explanation:

data

7.4 billion people

each person occupied 13 inches

Earth circumference = 25000 miles

length of the lines = 13 in x 7.4 billion people

= 13 x 7 400 000 000

= 9.62 x 10 ¹⁰ in

Convert in to miles

1 mile --------------- 63360 in

x mi --------------- 9.62 x 10 ¹⁰ in

x = 1518308.1 mi

Now divide, the line of people by the circumference

# of times = 1518308.1 mi / 25000 mi = 60.7

3 0

3 years ago

the height of a triangle is 9m less than its base. the area of the triangle is 56 m^2 find the length of the base (SHOW STEPS)

Veronika [31]

Hey there :)

We know the area formula of a triangle
$\frac{1}{2} (base)(height)$

We are given:
The area = 56 m²
The base = let p represent this
The height = 9 m less than the base = p - 9

Apply the formula
56 = $\frac{1}{2}$ × ( p ) × ( p - 9 )
56 = $\frac{1}{2}$ × ( p² - 9p )

Divide $\frac{1}{2}$ on both sides
56 ÷ $\frac{1}{2}$ = p² - 9p
112 = p² - 9p

Bring 112 to the other side and equate equation to 0
p² - 9p - 112

Factorise { Sum = -9 , Product = - 112 , therefore suitable factors = - 16 × 7 )
( p - 16 )( p + 7 ) = 0
↓ ↓
p = 16 p = - 7 ← Reject p = - 7 since length cannot be negative

So, the length of the base is 16 m

Check:
56 m² = $\frac{1}{2}$ × 16 × ( 16 - 9 )
56 m² = 8 × 7
56 m² = 56 m²

7 0

3 years ago