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3 years ago

3.54 + 1.2 = Explain how to get answer

Mathematics

2 answers:

inessss [21]3 years ago

8 0

Lime them up and add

klemol [59]3 years ago

5 0

Answer: 4.74

Step-by-step explanation: line up the decimal in 3.54 with the decimal with 1.2 Once you lined them up, and a zero to the 1.2(if u want to because its just a place holder)

//Give thanks(and or Brainliest) if helpful (≧▽≦)//

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15 times 25 is equal to

user100 [1]

15 * 25 = 375 <=== simple multiplication

8 0

4 years ago

Need help ASAP 3 question. WILL GIVE BRAINLIEST

fomenos

Answer:

Exact form: 11/125

Decimal Form: 0.088

Step-by-step explanation:

6 0

3 years ago

Approximately 3 people out of every 30 are left handed. About how many left handed people would you expect in a group of 140 peo

lord [1]

We can set this up by saying:
3 / 30 = x / 140 now we can solve!
1 / 10 = x / 140
x = 140 / 10
x = 14

Hope this helps! :)

6 0

3 years ago

A small town has 800 inhabitants. At 8 AM, 120 people have heard a rumor. By noon half the town has heard it. At what time will

nalin [4]

Answer:

At what time will 90% of the population have heard the rumor?

The rumor was heard by 90% of the population in 5.9 hours or 5 hours and 54 minutes

So, at 1:54 pm, 90% of the population had heard the rumor.

Step-by-step explanation:

To resolve this exercise we need to know the exponential model:

$P_(_t_)= P_0 *e^k^t$ (1)

Where:

$P_(_t_):$ the quantity inhabitants in certain time who heard the rumor

$P_0:$ Initial people who heard the rumor

k: constant

t: time frame

We know in 4 hours ( $12-8=4$ hours) half the town has heard the rumor because:

$Half town= \frac{800}{2}=400$ inhabitants

With this information we can find the constant (k), because we have all the information in $t=4 hours$

$P_(_4_)=$ 400 people

$P_0=$ 120 people

t= 4 hours

When we replace in equation 1 we have:

$400=120e^4^k$

$\frac{400}{120} =e^4^k$

$\frac{10}{3}=e^4^k$

We multiply by natural logarithm on both sides of this equation and we have:

$Ln(\frac{10}{3} )= 4*k\\k=\frac{Ln(\frac{10}{3} )}{4}$

With the constant (k) we can find at what time 90% of the population have heard the rumor

$800*0.9=720 people$ (90% of the population)

So we have:

$P_(_t_)=$ 720 people

$P_0=$ 120 people

$k=\frac{Ln\frac{10}{3}}{4}$

When we replace in equation 1 we have:

$720=120*e^\frac{Ln\frac{10}{3} }{4} ^*^t$

$\frac{720}{120}=e^\frac{Ln\frac{10}{3}}{4}^t\\6=e^\frac{Ln\frac{10}{3}}{4}^t$

We multiply by natural logarithm on both sides of this equation and we have:

$Ln 6 = \frac{Ln\frac{10}{3}}{4}*t\\$

$4*Ln 6 = Ln\frac{10}{3}*t\\t=\frac{4*Ln 6 }{Ln\frac{10}{3}}$

$t=\frac{4*1.79}{1.20} \\t=\frac{7.16}{1.20} \\t=5.9 hours$

We can find how many minutes are 0.9 hours:

$0.9hours\frac{60 minutes}{1hour} = 54 minutes$

t= 5 hours and 54 minutes

Now, we know the rumor was heard by 90% of the population in 5.9 hours or 5 hours and 54 minutes

So, at 1:54 pm, 90% of the population had heard the rumor.

4 0

3 years ago

Swapna is 26 years older than her daughter Suma. 6 years later, Swapna will be thrice as old as Suma. Find their present ages.

OLga [1]

Ages of swapna and suma are 33 and 7 years old respectively

Let the present age of Swapna be x
Let the age of Suma be y

If<em> Swapna is 26 years older than her daughter Suma</em>, then;

x = y + 26 ............... 1

6 years later:

Age of Swapna = x + 6

Age of Suna = y + 6

If Swapna will be thrice as old as Suma, then;

x + 6 = 3(y + 6) ................. 2

Substitute equation 1 into 2:

y + 26 + 6 = 3y + 18

y + 32 = 3y + 18

-2y = -14

y = 7

Since x = y + 26

x = 26 + 7

x = 33

Hence ages of swapna and suma are 33 and 7 years old respectively

Learn more on equation here: brainly.com/question/2972832

3 0

2 years ago