**Answer:**

240 cubes

**Step-by-step explanation:multiply all sides then divide by1/2**

**4x10x3=120**

**120/1/2=240**

**Answer:**

5x - 1

**Step-by-step explanation:**

(f + g)(x) = f(x) + g(x), thus

f(x) + g(x)

= 3x - 2 + 2x + 1 ← collect like terms

= 5x - 1

**Answer:**

**The nth term of the given sequence is .**

**Step-by-step explanation:**

Here, the first term of the sequence = 54

Second term = 18

Third term = 6

Now,

and,

as

Hence, the terms of the given sequence are in **GEOMETRIC PROGRESSION **with common ratio = 1/3

Now, the nth term in GP is given as

So here,

**Hence, nth term of the given sequence is .**

**Answer:**

area will be four times the first area

**Step-by-step explanation:**

the diameter of the first sphere=d

therefore radius=d/2

=r

the diameter of the second sphere becomes 2d

therefore the radius of second sphere=2r

area of a sphere=4×pi×r^2

the ratio of the two spheres=(4pi(2r)^2)/(4pir^2)

=(4pi4r^2)/4pir^2

cancelling 4pir^2, you get 4:1

therefore the area of the second sphere is 4 times the first one

Ok so firsst you do 40-20=20 20÷2.50=8 so that means amelia needs to babysit 8 hours to get $40

hope this helpd