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3 years ago

7

Select the correct answer.

1 answer:

Kipish [7]3 years ago

8 0

Answer:

its b

Step-by-step explanation:

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Flying against the wind, an airplane travels 2520 kilometers in 4 hours. Flying with the wind, the same plane travels 9450 kilom

bagirrra123 [75]

Using the relation between velocity, distance and time, it is found that:

The rate of the plane is of 840 km/h.

The rate of the wind is of 210 km/h.

<h3>What is the relation between velocity, distance and time?</h3>

Velocity is <u>distance divided by time</u>, that is:

$v = \frac{d}[t}$

Flying against the wind, an airplane travels 2520 kilometers in 4 hours, that is:

$v - v_w = \frac{2520}{4}$

$v - v_w = 630$

$v = 630 + v_w$

Flying with the wind, the same plane travels 9450 kilometers in 9 hours, hence:

$v + v_w = \frac{9450}{9}$

$v + v_w = 1050$

$v = 1050 - v_w$

Hence, solving for the wind's speed:

$630 + v_w = 1050 - v_w$

$2v_w = 420$

$v_w = \frac{420}{2}$

$v_w = 210$

For the plane, we have that:

v = 1050 - 210 = 840.

More can be learned about the relation between velocity, distance and time at brainly.com/question/24316569

#SPJ1

6 0

2 years ago

Someone please help me??

lapo4ka [179]

The standard equation of a circle with centre (xc,yc) and radius R is given by

$(x-x_c)^2+(y-y_c)^2=R^2$

Substituting
centre (xc,yc) = (4,-3)
R=2.5

The equation is therefore

$(x-x_c)^2+(y-y_c)^2=R^2$
$(x-4)^2+(y-(-3))^2=2.5^2$
$(x-4)^2+(y+3)^2=2.5^2$ or
(x-4)^2+(y+3)^2=6.25

7 0

3 years ago

Martha made 3 birthday cards and she wants to make more. If she makes 5 cards an hour, how many cards will she have after 6 hour

zhannawk [14.2K]

The rate of change is 5 cards / hour
Multiply 5 and 6
She makes 30 cards in 6 hours
Hope this helps!

7 0

4 years ago

6/16=9/x what is the value of x

Olenka [21]

Answer:

6/16=9/x

that would be 24

6 0

3 years ago

Hey I was just wondering if anyone can give me a better explanation on how to work with Negative numbers and and fractions when

Soloha48 [4]

Answer:

see explanation

Step-by-step explanation:

Given

$\frac{6(2a-4c)-6(6a-4b)+3(4b-8c)}{4}$

Distribute the 3 parenthesis on the numerator

= $\frac{12a-24c-36a+24b+12b-24c}{4}$

Collect like terms on the numerator

= $\frac{-24a+36b-48c}{4}$

Divide each of the terms on the numerator by 4

= $\frac{-24a}{4}$ + $\frac{36b}{4}$ + $\frac{-48c}{4}$

= - 6a + 9b - 12c ← factor out - 3 from each term

= - 3(2a - 3b + 4c)

Compare with

X(2a + Bb + Cc) to obtain

X = - 3, B = - 3, C = 4

3 0

4 years ago