Answer:
A. 2x-4
Step-by-step explanation:
Let his brother's age be 
.
Derrick is 4 years younger than twice his brother's age. Which means derrick is 4 years younger than 
.
Which makes derricks age 
since he is 4 years younger
1:2
Looking at the image, there are 2 grey squares and 1 black square. Since the question is asking how many black squares to grey squares, it would be a 1:2.
Answer:
2:3
Step-by-step explanation:
divide both by 6.
The answer is 250 cm³
We need to calculate V = Vr - Vp
V - the <span>volume of the space outside the pyramid but inside the prism
Vr - the volume of the rectangular prism.
</span>Vp - the volume of the pyramid<span>
Vr = w * l * h
w = l = 5 cm
h1 = 12 cm
Vr = 5 * 5 * 12 = 300 cm</span>³<span>
Vp = w * l * h / 3
w = l = 5 cm
h2 = h1/2 = 12/2 = 6 cm
Vp = 5 * 5 * 6 / 3 = 50 cm</span>³
V = Vr - Vp = 300 cm³ - 50 cm³ = 250 cm³
