A skater is on an ice rink. His right skate has an area of 7.8 cm2 in contact with the ice, but his left skate only has 3 cm2 in contact with the ice. With his right foot he exerts a pressure on the ice of 50 N/cm2.
He applies an equal force with his left foot.
What is the pressure exerted by his left foot in N/cm2?

130 N/cm2

Step-by-step explanation:

7.8 cm2 -> 50N/cm2

3 cm2 -> x N/cm2

x = (50×7.8) / 3

x = 130N/cm2

it would take 7/10 of an hour too fill the pool.

step-by-step explanation:

region b will make the inequalities y < 2x + 1 and y > -x - 2 true ⇒ answer a

step-by-step explanation:

* lets study the graph and the inequality to solve the question

- the inequality y > -x - 2

∵ the form of the inequality is y > mx + c , m is the slope of the line

  and c is the y-intercept (the line intersect y-axis at point (0 , c)

∴ c = -2 that means the line intersect the y-axis at point (0 , -2)

∵ the sign of the inequality is >

∴ we shad the part over the line

  region a and b

- the inequality y < 2x + 1

∵ the form of the inequality is y > mx + c , m is the slope of the line

  and c is the y-intercept (the line intersect y-axis at point (0 , c)

∴ c = 1 that means the line intersect the y-axis at point (0 , 1)

∵ the sign of the inequality is <

∴ we shad the part under the line

  region b and c

∵ the common region between the two lines is region b

∴ region b will make the inequalities y < 2x + 1 and y > -x - 2 true