A10 foot ladder is placed against a house. if the base of the ladder is 3.5 feet from the base of the house, how high does the ladder reach on the house

Think of a right triangle whose hypotenuse is the ladder length, or 10 ft.  
We can apply the Pythagorean Theorem here:

10^2 = 3.5^2 + y^2, where y is the height of the top of the ladder as measured from the ground.

Then 100 = 12.25 + y^2, so that y^2 = 100 - 12.25, or y^2 = 87.75.

Then the answer is y = sqrt(87.75) = 9.37 ft.

What is the last question i don’t see it?

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c