Answer:
see explanation
Step-by-step explanation:
1
x - 4 = 20 ( multiply through by 3 to clear the fraction )
2x - 12 = 60 ( add 12 to both sides )
2x = 72 ( divide both sides by 2 )
x = 36
2
4 = ( multiply both sides by 2 to clear the fraction )
8 = - 1 + x ( add 1 to both sides )
9 = x
3
12(x + 9) = - 108 ( divide both sides by 12 )
x + 9 = - 9 ( subtract 9 from both sides )
x = - 18
4
5x + 14 = - 7 ( subtract 14 from both sides )
5x = - 21 ( divide both sides by 5 )
x = - = - 4.2
Answer:
KE = 900,000t²
Step-by-step explanation:
The formula for calculating the kinetic energy of a body is expressed as KE = 1/2mv² where;
m is the mass of the sport car = 2000kg
v is the velocity of the car
Since v = at
v = 30t
Substituting the given values into the KE formula;
KE 1/2 * 2000 * (30t)²
KE = 1000*900t²
KE = 900,000t² Joules where t is the time measured in seconds
Answer: the answer is C.
Step-by-step explanation:
Answer:
A,D,E
Step-by-step explanation:
scaled copy means the ratio of the two lengths would be same proportional constant.
The proportionality constant for Rectangle A is:
12/3 = 4
So any scaled version will have this proportionality constant same (4).
let's check:
A) 6/1.5 = 4 (OK)
B) 10/2 = 5 (NOT OK)
C) 13/4 = 3.25 (NOT OK)
D) 18/4.5 = 4 (OK)
E) 80/20 = 4 (OK)
So, correct options are A, D, and E