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Lilit [14]
3 years ago
13

One brother says of his younger brother: “Two years ago, I was three times as old as my brother was. In three years’ time, I wil

l be twice as old as my brother.” How old are they each now?
Good Luck!!
Mathematics
2 answers:
aleksklad [387]3 years ago
5 0

Answer:

17

Step-by-step explanation:

Let us suppose two years ago my brother's age was x years

Then, my age was 3x

Three years from now, my brother's age will be (x +2+3) = (x+5) years

And my age will be (3x+2+3) = (3x+5) years

But it is given that i will be twice as old as my brother.

So, 2(x+5)= (3x+5)

or, x= 5 years

So my brother's present age is 5+2= 7 years

And my age is 5*3+2= 17 years

Crank3 years ago
4 0
Pretty sure that the answer is 17
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Define the following sequence recursively: 96, 48, 24, 12, ....
Naddika [18.5K]

Answer:

I do not see that any of your options will work.

Step-by-step explanation:

a) and b) have a false first statement because f(1) = 96, not 12

c) would create the sequence 96, 1152, 13824

d.) would create the sequence 96, 192, 384. 768...

I believe the correct answer would be

f(1) = 96     f(n) = ½f(n-1)  n ≥ 2

which could be either c) or d) if taking potential typographic errors into account. Recording a "2" or "12" where a "½" ought to be.

5 0
3 years ago
Mia lives in a neighborhood that has many pets. The mean number of pets in the neighborhood is 7. House one has four pets, house
Nataliya [291]

Answer:

Mia has 5 pets

Step-by-step explanation:

Mean of pets=7

house 1 (4pets),house 2 (12 pets)

12 +4 +5=21

21÷3=7

3 0
3 years ago
Find two factors of 18 with the sum of 19
soldi70 [24.7K]
A*b=18 ____[1]
a+b=19____[2]

[2] a=19-b ___[3]

put [3] in [1]
(19-b)*b = 18
19b-b^2 = 18
b^2-19b+18 = 0
(b-18)(b-1) = 0
so b=18 or b=1

if b=18 then a=19-18=1
if b=1 then a=19-1=18

SO two factors are 1 and 18
5 0
4 years ago
22x+11=4x-7 help me with equation please!
Talja [164]
Okay first

22x+11=5x-7
You need to move the variables so it eaquals 0

22x+11-5x+7=0

Now combine like terms

17x+18=0

Move 18 over to divide

17x=-18

X= -1.1 or just -1

Good luck! :D
8 0
3 years ago
A car averages 28.5 miles per gallon of gasoline. How many liters of gasoline will be needed for a trip of 415 km? Some conversi
GrogVix [38]

Answer:

34.22 liters

Step-by-step explanation:

Step one:

Given data

A car averages 28.5 miles per gallon of gasoline

How many liters of gasoline will be needed for a trip of 415 km

let us convert 415km to miles first

1 km is 0.621371 miles

415km is x miles

cross multiply we have

x= 415*0.621371

x=257.86 miles

Step two:

if 1 gallon of gasoline will cover 28.5 miles

the x gallons will cover 257.86 miles

cross multiply we have

28.5x= 257.86

divide both sides by 28.5

x= 257.86/28.5

x=9.04 gallons

Step three:

let us convert gallons to liters

1 gallon is 3.78541 liters

9.04 gallons will be x liters

cross multiply we have

x=9.04*3.78541

x= 34.22 liters

5 0
3 years ago
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