Marcus is building a model of Earth using a sphere with a surface area of 400 TT SA
square inches. Use the formular = where r is the radius of the sphere and SA
is the surface area, to find the radius of the sphere Marcus is using for his model.
41

r = 6.69 inches

Step-by-step explanation:

We have,

Marcus is building a model of Earth using a sphere with a surface area of .

It is required to find the radius of the sphere Marcus is using for his model.

The surface area of a circular shaped object is given by :

r is radius

So, the radius of the sphere is 6.69 inches.

answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

step-by-step explanation:

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.