Ask question

Ask question

All categories

3 years ago

12

Tesfa is x years old. his father is 4 times as old as Tesfa. Her mother is 7 years younger than his father. If their three ages

add up to 101 years, how old is Tesfa?

1 answer:

4vir4ik [10]3 years ago

6 0

tesfa = x

dad = 4x

mom= 4x-1

x+4x+4x-1=101

9x+1=101

9x=100

100/9= 11.1

You might be interested in

Hello, I need help with a math question, please tell me if I am right. *Refer to the photo*

Trava [24]

As I can tell the tables are right but it would be a function since none of the x's repeat

5 0

3 years ago

Will give Brain please help

erastovalidia [21]

Answer:

5

Step-by-step explanation:

3(x+3)=4(4+2)

3x+9=24

3x=15

x=5

Have a good day!

5 0

2 years ago

How long did it take a biker to travel 20 miles at 12mph

Anika [276]

Time = Distance / speed

Time = 20 miles / 12mph

Time = 1 and 2/3 hours ( 1 hour and 40 minutes)

5 0

3 years ago

91% of the students lost the bingo game.What percent of the students won the game?

Aleksandr [31]

9 percent won the game

5 0

3 years ago

Read 2 more answers

A particle moves along the x-axis so that at any time t, t ≥ 0, its acceleration is a(t) = -4sin(2t). If the velocity of the par

sasho [114]

The velocity of the particle is given by

$v(t)=v(0)+\displaystyle\int_0^ta(u)\,\mathrm du$

Since $a(t)=-4\sin2t$ and $v(0)=7$ , we get

$\displaystyle\int_0^ta(u)\,\mathrm du=\int_0^t-4\sin2u\,\mathrm du=2\cos2u\bigg|_0^t=2\cos2t-2$

$\implies v(t)=2\cos2t+5$

Similarly, the position function is obtained via

$x(t)=x(0)+\displaystyle\int_0^tv(u)\,\mathrm du$

We know $v(t)$ and we're told that $x(0)=0$ , so

$\displaystyle\int_0^tv(u)\,\mathrm du=\int_0^t(2\cos2u+5)\,\mathrm du=\sin2u+5u\bigg|_0^t=\sin2t+5t$

$\implies x(t)=\sin2t+5t$

making the answer A.

3 0

3 years ago