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3 years ago

PLZ HURRY IT'S URGENT!!!!!!

Mathematics

2 answers:

Gnom [1K]3 years ago

7 0

Answer:

D. 9

Step-by-step explanation:

We have been given an equation and we are asked to find the solution for our given equation.

$t(7-2)=9\cdot 7-9\cdot 2$

Upon factoring out 9 from right side of our equation we will get,

$t(7-2)=9(7-2)$

$t(5)=9(5)$

$5t=9*5$

Upon dividing both sides of our equation by 5 we will get,

$\frac{5t}{5}=\frac{9*5}{5}$

$x=9$

Therefore, the solution to our given equation is 9 and option D is the correct choice.

Anton [14]3 years ago

5 0

I think the correct answer your looking for is D) 9

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Find the equation of the line that is parallel to the line x + 5y = 10 and passes through the point (1, 3).

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Answer:

see explanation

Step-by-step explanation:

The equation of a line in slope- intercept form is

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2 years ago

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Answer: see below

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3 years ago

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At noon, ship A is 130 km west of ship B. Ship A is sailing east at 25 km/h and ship B is sailing north at 20 km/h. How fast is

Hitman42 [59]

Answer:

answer = 12.87 km/h

Step-by-step explanation:

Given

Ship A is sailing east at 25 km/h = $\frac{dx}{dt}$

ship B is sailing north at 20 km/h = $\frac{dy}{dt}$

here x and y are the sailing at t = 4 : 00 pm for ship A and B respectively

so we get x = 4 ×25 =100 km/h

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let z is the distance between the ships, we need to find $\frac{dz}{dt}$ at t = 4 hr

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$z^2 = (130-x)^2 + y^2......................(i)\\put x = 100 and y = 80 \\\\we | | get \\$

$z^2 = 30^2 + 80^2\\z =\sqrt{7300} km/h$

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$2z\frac{dz}{dt} =$ $-2(130-x)\frac{dx}{dt}$ $+2y\frac{dy}{dt}$

$\frac{dz}{dt} =\frac{1}{z}[(x -130)\frac{dx}{dt} +y\frac{dy}{dt}]$

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$= \frac{1100}{85.44}\\ = 12.87km/h$

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