Ok so im not good with words and math, but i am going to try my best to explain it. first you will take 45/60 which is the 45 miles per hour. next you will put it equal to 40/x. x is how many minutes. they are set equal to each other because they are the same ratio. (i honestly dont know why you cross multiply, but you just do). you then multiply 40*60 and 45*x. this gives you 2400=45x. you then divide both sides by 45 and get 53 1/3 minutes. or 53 minutes and 20 seconds

7 0

3 years ago

A musician has just purchased a theremin — an instrument that can be played by moving your hands in the air. For every 30 centim

Kobotan [32]

Answer:

1665 hertz

Step-by-step explanation:

30 x 3.33 = 1 (1 meter) so 500 x 3.33 = 1665 (1 meter of movement)

8 0

2 years ago

Whats the Area? how do i find it? In these specific questions?

just olya [345]

The formula for finding the area of a square is:
${s}^{2}$

The formula for finding the area of a triangle is:
$\frac{1}{2} bh$

So for the square the area would be:
${2x}^{2} \times {2x}^{2} = {4x}^{2}$

The area for the triangle would be:

$\frac{1}{2} {2c}^{3} \times 4c = {4c}^{2}$

7 0

3 years ago

Picking a month of the year in the day of the week (fundamental counting principle)

inysia [295]

Since you mentioned the fundamental counting principle, I assume you are looking for the total number of possibilities.

If you are picking a month, there are 12 options.
If you are selecting a day of the week, there are 7 options.

If you are doing both, you multiply the two numbers together.
12 x 7 = 84

8 0

3 years ago

Pemdas(-10 + 2²) + 12 ​

Pemdas(-10 + 2²) + 12