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3 years ago

X/3=5/7 what is the value of x please show work

2 answers:

7 0

Cross multiply your fractions. if you have x/3=5/7, x*7 has to equal 3*5, meaning 7x=15. divide both sides by seven to get x=7/15.

Zigmanuir [339]3 years ago

4 0

Answer:

Step-by-step explanation:

X/3 = 5/7

Cross multiply

X×7 = 3×5

7X = 15

X = 15/7

X = 2 1/7

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Find dy/dx for y=log (tan2x)

nekit [7.7K]

Answer:

$\frac{dy}{dx} = \frac{2}{sin2x cos2x}$

Step-by-step explanation:

y = log (tan 2x)

Applying chain rule:

$\frac{dy}{dx} = \frac{d}{dx} (1st function) . \frac{d}{dx} (2nd function). \frac{d}{dx}(3rd function)$

$\frac{dy}{dx} = \frac{d}{dx} log(tan 2x) . \frac{d}{dx} tan2x. \frac{d}{dx} 2x$

$\frac{dy}{dx} = \frac{1}{tan2x} \times sec^{2}2x \times 2$

$\frac{dy}{dx} = \frac{2sec^{2}2x }{tan2x}$

Now since $sec^{2}x = \frac{1}{cos^{2}x } \ and\ tanx = \frac{sinx}{cosx}$

∴ $\frac{dy}{dx} = \frac{2cos2x }{sin2x cos^22x}$

∴ $\frac{dy}{dx} = \frac{2}{sin2x cos2x}$

7 0

4 years ago

A motorcyclist traveling at 30.7 km/h accelerates after passing a sign post marking the city limits. If it takes 4.9 seconds for

MissTica

Remark

Writing down the givens for these questions is almost a command. You must know which equation of the big 4 to use. The givens + what you want to find will determine the equation.

Givens

vi = 30.7 km/hr = 30.7 km/hr *[1000m/1km]*[1hr/3600sec] = 8.52m/sec

vf = 120 km/hr = 120 km/hr * [1000 m/1 km]*[1h/3600 sec] = 33.3 m/s

t = 4.9 seconds

d = ???

Formula

d = (vi + vf)*t/2

Solve

d = ( 33.3+8.52 )*4.9/2

d = (41.85333)*4.9/2

d = 205.02/2

d = 102.51 m<<<Answer

8 0

3 years ago

Read 2 more answers

What is aproxímate percent change in a temperature that went down from 120 degrees to 100 degrees

Papessa [141]

Answer:

16.7 percent

Step-by-step explanation:

you must find what percent 100 is of 120 and then subtract that percentage from 100

6 0

3 years ago

Factor 256x^3 - 500y^3

Lady bird [3.3K]

(256 • (x3) - ( 2^2• 5^3 y^3)
______________________________________________________________
 2^8 x^3 - ( 2^2 • 5^3 y^3)

256x^3 - 500y^3 = 4 • (64x^3 - 125y^3)

64x^3 - 125y^3
______________________________________________________________
final factoization:

(4x - 5y) • (16x^2 + 20xy + 25y^2)

5 0

3 years ago

Darcie wants to crochet a minimum of 3 blankets to donate to a homeless shelter. Darcie crochets at a rate of 1/15 of a blanket

Shalnov [3]

She can skip about 15 days because it takes 15 days to make 1 blanket, and 15*3=45; 60-45=15

6 0

3 years ago