Answer:
x^2-2x+3
Step-by-step explanation:
Answer:
x = 24
Step-by-step explanation:
Speed of the first car is 30 mph and that of the second car is 20 mph.
Step-by-step explanation:
- Step 1: Let the speed of the first car be x mph. Then the speed of the second car = x - 10 mph. Distance traveled by the second car = 60 miles. Find the time taken by the second car to travel this distance.
Time = Distance/Speed
= 60/x - 10 ------ (1)
- Step 2: Find the time taken by the first car to travel given distance of 90 miles.
Time = 90/x ------- (2)
- Step 3: Given that both cars take the same amount of time, equate the 2 equations. (1) = (2)
⇒ 60/x - 10 = 90/x
⇒ 60x = 90(x-10)
⇒ 2x = 3(x - 10)
⇒ 2x = 3x - 30
⇒ -x = -30
∴ x = 30 mph
⇒ x - 10 = 30 - 10 = 20 mph
A.
100%=all
so if 25% is dark and the rest is milk then
dark+milk=all
25%+milk=100%
minus 25% both sides
milk=75%
so
if milk chocolate=3lb then
3lb=75%
divide by 3
1lb=25%=dark chocolate
oops, I didn't use an equation
hmm
ratios and things
75%=milk
25%=dark
so we got
for m=pounds of milk chocolate
and d=dark chocolate
m/d=72/25 or m/d=3 and
m=3
duh
3/d=3
3=3d
1=d
B. 1 lb dark chocolate