Answer:
nine hundred thirty-eight one hundred twenty thousandths
Step-by-step explanation:
Answer:
The answer is the first one
Step-by-step explanation:
X-5=speed of car B
x = speed of car A
Distance = speed times time
distances is equal so
(x-5)(4.5)=(x)(4)
4.5x-22.5=4x
multiply both sides by 2 to get rid of the decimals
9x-45=8x
subtract 8x from both sides
x-45=0 a
add 45 to both sides and get
x=45
speed of car A = 45 mph
Speed of car B = 45-5 or 40 mph
Speed of car B = 40 mph
3x^2 = 2x^2 + 25
(Taking 2x^2 to the LHS)
3x^2 - 2x^2 = 25
1x^2 = 25
(Taking square roots on both sides)
x = root25
x = +5 or -5
(as both answers lead to 25
-5 * -5 = +25
+5 * +5 = +25)
You may write the answer as +5 according to your convenience.
Hope this helped!
