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Lnjayy
04.02.2020 •
Mathematics
Moe is 12 years older than barney .three years ago ,moe was five times as old as barney .how old is barney now
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Ответ:
m-3=5(b-3)
sub 12+b for m
12+b-3=5(b-3)
expand and combine like terms
b+9=5b-15
minus 4b both sides
9=4b-15
add 15 both sidse
24=4b
divide by 4
6=b
barney is 6
moe is 18
3 years ago, barney is 3 and moe is 15, 3*5=15
barney is 6 now
Ответ:
Step-by-step explanation:
at time = 0min,
height, h0 = 10.5cm
area, a0 = 95cmsq
base, b0 = a0 x2/h0
=> b0 = 95 x2 / 10.5 = 18.1cm
at time = 1 min,
increase of height, rh = 1.5cm/min
height at 1 min, h1 = h0 x rh
=> h1= 10.5 × 1.5 = 15.75cm
increase of area, ra = 4.5cmsq/min
area after 1 min, a1 = a0 x ra
=> a1= 95 x 4.5 = 427.5cm/sq
base at 1 min, b1 = a1x2/h1
=> b1 = 427.5 x 2 /15.75 = 54.3 cm
rate of increase for base, rb = b1/b2
=> rb = 54.3/18.1 = 3cm/min