You need to find the measure of one interior angle. You must find the value of the exterior angle and subtract that from 180 degrees (they are supplementary:_/_).The formula to find the value of an exterior angle is 360/n where n is the amount of sides
360/9=40
subtract from 180
180-40=140
multiply 9 (there is 9 angles)
140*9=1260 degrees
Sam is 5
Tom is 3 times older so 3*5=15
The difference between them is 15-5=10 years
When Sam is 20 we add the difference 20+10=30, and we have Tom's age :)
Answer:
The middle slab is 2 cubic feet.
Step-by-step explanation:
The problem presents the information: Mr. Alvarez makes a walkway out of 3 cement slabs.
However, he uses 14 Cubic feet of cement to make the walkway. Each square slab has a volume of 4 cubic feet.
Mr. Alvarez makes the way with 3 cement slabs (NC), each cement slab is 4 cubic feet (UC). It means, the cubic feet for the 3 cement slabs (CS) are:
CS = NC* UC = 3*4 = 12 cubic feet.
It means Mr. Alvarez uses 12 cubic feet with 3 cement slabs.
Mr. Alvarez used in total of 14 cubic feet of cement (TC). At this moment he used 12 cubic feet of cement (CS). It means, there will be a part of the cement slab used (PC).
PC = TC - CS = 14 - 12 = 2 Cubic feet.
Finally, the middle slab is 2 cubic feet of cement.
Y = mx + b
slope(m) = -3/8
(5,-4)...x = 5 and y = -4
now we sub and find b, the y int
-4 = -3/8(5) + b
-4 = -15/8 + b
-4 + 15/8 = b
-32/8 + 15/8 = b
-17/8 = b
y = -3/8x - 17/8.....add 3/8x to both sides
3/8x + y = -17/8...multiply everything by 8
3x + 8y = - 17 <=== standard form