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3 years ago

Divide 30cm into the ratio 2:4

2 answers:

8 0

First you add the two parts of the ratio.
2 + 4 = 6

then you divide

30 / 6 = 5

then you multiply into the original ratio

(2 x 5) : (4 x 5)

10 : 20

Verizon [17]3 years ago

7 0

Hey there, 30:15, 2:4 simplified is 1:2, 15*2=30 and 1*30=30,

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Bill bought a shirt for $35.80 plus he paid an additional 7% in sales tax.

dezoksy [38]

Answer:

$2.50

Step-by-step explanation:

The cost for the shirt is 35.80

7%=0.07

35.80 x 0.07 = 2.50

Answer is $2.50

3 0

3 years ago

Helpppp I’ll mark brainliest

Svetllana [295]

X is 5
Y is 25 and then you just multiply by 3 each time

3 0

3 years ago

A city's population is currently 500,000. If the population doubles every 65 years, what will the population be 130 years from n

kompoz [17]

Answer:

2,000,000

Step-by-step explanation:

Simple maths, really.

65 times 2 is 130, and the population is already 500,000 with no time passing. 65 years later, the population would be 1,000,000. 65 years after that, the population would double again, so the answer would be 2 million.

Hope this helped!

5 0

3 years ago

A lap around Natalie's neighbourhood is 20 kilometres. Natalie ran 2 laps before

Fynjy0 [20]

I would say about 40 kilometers it’s ifs 20 around her neighborhood that 20+20=40 and walking tha rest made the question easier but yea 40

8 0

3 years ago

Find dy/dx by implicit differentiation.

kow [346]

dy/dx by implicit differentiation is cos(πx)/sin(πy)

<h3>How to find dy/dx by implicit differentiation?</h3>

Since we have the equation

(sin(πx) + cos(πy)⁸ = 17, to find dy/dx, we differentiate implicitly.

So, [(sin(πx) + cos(πy)⁸ = 17]

d[(sin(πx) + cos(πy)⁸]/dx = d17/dx

d[(sin(πx) + cos(πy)⁸]/dx = 0

Let sin(πx) + cos(πy) = u

So, du⁸/dx = 0

du⁸/du × du/dx = 0

Since,

du⁸/du = 8u⁷ and

du/dx = d[sin(πx) + cos(πy)]/dx

= dsin(πx)/dx + dcos(πy)/dx

= dsin(πx)/dx + (dcos(πy)/dy × dy/dx)

= πcos(πx) - πsin(πy) × dy/dx

So, du⁸/dx = 0

du⁸/du × du/dx = 0

8u⁷ × [ πcos(πx) - πsin(πy) × dy/dx] = 0

8[(sin(πx) + cos(πy)]⁷ × (πcos(πx) - πsin(πy) × dy/dx) = 0

Since 8[(sin(πx) + cos(πy)]⁷ ≠ 0

(πcos(πx) - πsin(πy) × dy/dx) = 0

πcos(πx) = πsin(πy) × dy/dx

dy/dx = πcos(πx)/πsin(πy)

dy/dx = cos(πx)/sin(πy)

So, dy/dx by implicit differentiation is cos(πx)/sin(πy)

Learn more about implicit differentiation here:

brainly.com/question/25081524

#SPJ1

6 0

2 years ago