The number of cubes is 27
the volume is 36 centimeters cubed
The answers are:
a) 9 and 5
b) 11 and 7
c) 14 and 8
a² - b² = (a + b)(a - b)
a) The answer is 9 and 5
45= a² - b²
45 = 49 - 4 = 7² - 2² = (7 + 2)(7 - 2) = 9 * 5
b) The answer is 11 and 7
77 = a² - b²
77 = 81 - 4 = 9² - 2² = (9 + 2)(9 - 2) = 11 * 7
c) The answer is 14 and 8
112 = a² - b²
112 = 121 - 9 = 11² - 3² = (11 + 3)(11 - 3) = 14 * 8
Answer:
I'm not good with the type of math on 3, so I'm going to answer 4. (P.S I don't know the question you're asking, so I'm going to assume you want to know the area and perimeter of the shapes.
Step-by-step explanation:
To solve number 4 I added the width of the 2 triangles to give me the width of the rectangle, so then 2 times 9 is 18. Then for the triangles. The formula for triangles is base times height divided by 2. So we add the areas of all shapes and we get: 18+6+24=48m. So the area for number 4 is 48 meters.
(hope this was your question)
Expand out the brackets and simplify, largest indices first.
12x³-21x²+67x+30