Answer:

**Speed = 20 mi/h**

Explanation:

There are two points A and B

Distance between both the points are define with function -20t + 45 miles

where t represent the number of hours of travelling.

Now firstly we find the initial position. At starting time is 0, so we put t=0 in given function of t.

At t=0;

d₀ = -20(0) + 45 = 0 + 45 = 45 miles

Now we find the distance travell after starting first hour.

Than we put t = 1 in the given function

At t = 1;

d₁ = -20(1) + 45 = -20 + 45 = 25 miles

Difference between d₁ & d₀ is

45 - 25 = 20 miles

We see that in one hour, total distace is covered 20 miles

Now we use time, speed, distance relation

Speed =

S =

**S = 20 miles/hour**

That's the final answer.

I hope it will help you.

**Answer:**

**(x + 2) (x + 1) thus b: is the Answer**

**Step-by-step explanation:**

Factor the following:

x^2 + 3 x + 2

The factors of 2 that sum to 3 are 2 and 1. So, x^2 + 3 x + 2 = (x + 2) (x + 1):

Answer: (x + 2) (x + 1)

**Answer:**

True.

Here, radius of the sphere = radius of the cylinder = r

Diameter of the sphere = height of the cylinder = 2r

Surface area of the sphere = 4πr2

Curved surface area of the cylinder = 2πr (2r) = 4πr2

**Step-by-step explanation:**

Answer:

A. AB

Step-by-step explanation:

Given that the musical instrument has a shape of ∆ABC, we can determine the shortest side that would be parallel to the ground by comparison of the 3 angles of the triangle corresponding to each side that is opposite each of them.

What this means is that, the larger angle would have the largest side opposite it. The medium angle will have medium length side opposite it, while the smallest angle will have the smallest side opposite it.

m < A = 59°

m < C = 57°

m < C = 180 - (59+57) (sum of angles in a triangle)

m < C = 64°

The smallest angle out of the three angles is angle C = 57°.

The side opposite it, is side AB.

Side AB is the shortest side of ∆ABC.

Therefore, AB should be parallel to the ground.

**Answer:**

I think it is 30

**Step-by-step explanation:**

05 X 06 = 30

Hope this helps!! :)