Aplane can travel 640 miles against the wind in the same time it can travel 800 miles with the wind. if the plane can fly 180 mph in calm air, what is the speed of the wind? if x represents the speed of the wind, which expression represents the time it takes for the plane to travel the 640 miles against the wind?

640/(180 - x)

Step-by-step explanation:

d) 30 units^2

area of rectangle = l × b

we know,

length = 10 unit

breadth = 3 unit

applying the formula,

= l × b

= 10 × 3

= 30 unit^2

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the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950