Answer:
Step-by-step explanation:
P=2(L+W), we are given a side of 20 and a side of b
P=2(20+b)
P=40+2b
A) P(6)=40+12=52ft TRUE
B) P(8)=40+16=56ft TRUE
C) P(10)=40+20=60ft FALSE
D) P(12)=40+24=64ft FALSE
E) P(11)=40+22=62ft FALSE
So only A and B are true
Answer:
Step-by-step explanation:
In algebra we work with variables and numerals. To evaluate an algebraic expression simply means that you are going to determine the value of an expression by substituting and evaluating using the operation order.
in summary in order to evaluate an algebraic expression
- you must identify the variable and its value
- you will substitute the given value for the variable
- complete the necessary calculations
Take for example;
evaluate 2a + 4b - 2c
given that a = 2 , b = 1 , c = 5
since you already know the value of the variables you substitute them into the question
we have
2(2) + 4(1) +2 ( 5)
4 + 4 + 10
18.............. answer.
Answer:
The cross section of a pyramid that is perpendicular to the base will be a triangle.
Step-by-step explanation:
C) The 2 triangles are similar , then we can write:
5x/45 = 20/36 . Cross multiplication:
5x*36 = 45*20
180x = 900 and x = 900/180 , x = 5 (and 5x = 25)
d) Remember the proportionality theorem (or Thales')
You can write the following proportion:
GH/HJ = KL/LM
8/6 = 10/x . Cross multiplication:
8x = 60 and x = 60/8 , x = 7.5
Answer:
-4
Step-by-step explanation:
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