Acute angles is the answer
This kind of problem request the use of harmonic mean:
if t₁ is the Time spent by Jessica, and
t₂, the time spent by Felecia, and t₃ the time spent by both, then the equation of that kind of problem will be:
1/t₁ + 1/t₂ =1/t₃.
t₁ = 1h45 min, t₂ (unknown, to be calculated), t₃ = 1 h, to ease things let' convert the time in minutes
t₁ = 105 min
t₂ = ?(time needed to Felicia to maw the lawn)
t₃ = 60 min
1/105 +1/t₂ = 1/60===> 1/t₂ = 1/60 - 1/105==> 1/t₂ =1/140
& t₂ =140 minutes or t₂ = 2h & 20 min
We can simply set the two equations equal to each other:
60x+10=40x+70
We subtract 40x+10 from both sides to get:
20x=60
Divide by 20 to find that x=3. Substitute this back into either equation to find the amount of miles - using the first, 60*3+10=190, so the answer is D.
Answer:
42 Feet
Step-by-step explanation:
Buffet area:60 ft
dining area:18 ft
60 ft-18 ft= 42 ft
He can buy 1 1\4 ounce for a dollar or 1.25 ounces or depending on your answer choice 1 ounce. All those answer are right