Answer:
Perimeter is 4a - 10
Area is a^2 - 5a
Step-by-step explanation:
Two sides of the rectangle are "a" and two sides of the rectangle are "a-5" add all four sides and you get a+a+a-5+a-5 Combine the like terms and you get 4a - 10.
The area is when you multiple the two sides together
A = lw
A - a(a-5) = a^2 - 5a
Answer:
60
Step-by-step explanation:
A decrease in the ratio 3 : 4 implies that
new value : old value = 3 : 4
x : 80 = 3 : 4
x/80 = 3/4
x = 3/4 * 80
= 3 * 20
= 60
Well, if you do this in reverse
23+17 = 40
40-23 = 17
40 would be your answer.
Answer:
x=10. x=-8. x=5. x=10. x=120.
Step-by-step explanation:
If your trying to find x then get x by its self.
3x=2x +10 subtract 2x from both sides
x=10
5x=4x-8 subtract 4x from both sides
x= -8
x +5=2x subtract x from both sides
x=5
3x+10=4x subtract 3x from both sides
x=10
120+5x=6x subtract 5x from both sides
120=x
Answer:
9x^2 +12
Step-by-step explanation:
The area of a rectangle is given by
A = l*w
= 3 *(3x^2 +4)
Distribute
= 9x^2 +12