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2 years ago

9/20 - 1/4 Add or subtract. Write each sum or difference in simplest form. HELP!

Mathematics

1 answer:

Fynjy0 [20]2 years ago

6 0

I just divided 9 by 20 and 1 by 4 then subtract 0.45-0.25 = 0.2

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Four brothers and their sister have the average age 7. Four brothers have the average age 6. How old is the sister?

AnnyKZ [126]

Answer:

11 years old

Step-by-step explanation:

If four brothers have the average age 6, then the sum of their ages is

$4\cdot 6=24$

years.

Let x years be the age of sister. If four brothers and their sister have the average age 7, then

$\dfrac{24+x}{5}=7.$

Multiply this equation by 5:

$24+x=35\Rightarrow x=35-24=11.$

The sister is 11 years old.

4 0

3 years ago

Consider these functions f(x)=3x-7 g(x)=x+1/x-1 what is the of f(g(3)) answer

JulijaS [17]

Answer:

$\boxed{-1}$

Step-by-step explanation:

$g(3) = \frac{3 + 1}{3 - 1} = 2$

$f(g(3)) = 3(2) - 7 = -1$

3 0

2 years ago

6. Michael Johnson holds the Olympic record for the men's 400m race at 43 seconds. His

vlada-n [284]

The difference between both unit rates rounded off to the nearest tenth is: 0.4 meters per second

Step-by-step explanation:

We have to calculate his unit rate for both type of races

So,

Unit rate for 400m race:

Distance = 400m

Time = 43 sec

$Unit\ rate = U_1= \frac{Distance}{Time}\\=\frac{400}{43}\\=9.30\ meters\ per\ second$

Unit rate for 300m Race:

Distance = 300m

Time = 31 sec

$Unit\ Rate= U_2=\frac{300}{31}\\=9.68\ meters\ per\ second$

The difference between both unit rates is:

$U_2-U_1 = 9.68-9.30\\=0.38 => 0.4\ meters\ per\ sec$

Hence,

The difference between both unit rates rounded off to the nearest tenth is: 0.4 meters per second

Keywords: Unit rate, Speed

Learn more about unit rate at:

#LearnwithBrainly

7 0

2 years ago

Make p the subject of a=p-2b 2

professor190 [17]

Answer:

p= a +2b

Step-by-step explanation:

Making p the subject of the equation means that we need to arrive at the final answer of p= ____.

a= p -2b

a +2b= p (+2b on both sides)

p= a +2b

5 0

3 years ago

Which is the measure of angle C ?

zubka84 [21]

Answer:

Step-by-step explanation:

if the triangles are similar the ange B and E are the same, A and D are the same and C and F are the same.

B=77 and E=77

F=31 and C=31

A=72 and D=72

8 0

3 years ago