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3 years ago

4

The ratio of boys to girls in a group is 3:1. If there are 28 more boys than girls, work out how many people there are in total

help plz

2 answers:

Doss [256]3 years ago

6 0

Answer:

35

Step-by-step explanation:

3x=28

x=7

no.of total students=35

n200080 [17]3 years ago

3 0

3+1=4
28/4=7
3*7=21
1*7=7
28+7=35

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Rasek [7]

Answer:

its either ratio or unit rate.

Step-by-step explanation:

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3 years ago

If Mary deposits $275 in principal at an interest rate of 3.2 percent, how much interest will she earn in one year

nekit [7.7K]

Answer:

Mary earns interest in one year is $88 .

Step-by-step explanation:

Formula

$Simple\ interest = \frac{Principle\times rate\times time}{100}$

As given

If Mary deposits $275 in principal at an interest rate of 3.2 percent .

Principle = $275

Rate = 3.2%

Time = 1 year

Putting all the values in the formula

$Simple\ interest = \frac{275\times 3.2\times 1}{100}$

$Simple\ interest =\frac{880}{100}$

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Therefore the Mary earns interest in one year is $88 .

3 0

4 years ago

Read 2 more answers

solve the problem related to population growth.A city had a population of 23,900 in 2007 and a population of 25,100 in 2012.(a)

Finger [1]

Solution

a)

To find the exponential growth function, we apply the exponential growth formula which is

$N(t)=a(1+k)^t$

Where

$\begin{gathered} a\text{ is the }initial\text{ population} \\ k\text{ is the growth rate} \\ t\text{ is the number of time intervals} \end{gathered}$

Given that

$\begin{gathered} a=23,900 \\ N(5)=25,100 \\ t=2012-2007=5 \end{gathered}$

Substitute the variables into the exponential growth formula

$\begin{gathered} 25100=23900(1+k)^5 \\ \text{Divide both sides by 23,900} \\ \frac{25100}{23900}=\frac{23900(1+k)^5}{23900} \\ 1.05021=(1+k)^5^{} \\ \sqrt[5]{1.05021}=1+k \\ 1.00984=1+k \\ \text{Collect like terms} \\ k=1.00984-1 \\ k=0.00984 \end{gathered}$

Hence, the exponential growth function is

$\begin{gathered} N(t)=23900(1+0.00984)^t_{} \\ N(t)=23900(1.00984)^t \end{gathered}$

Hence, the exponential growth function is

$N(t)=23900(1.00984)^t$

b)

For the population of the city in 2022,

$\begin{gathered} t=2022-2007=15 \\ t=15 \end{gathered}$

Substitute for t into the exponential growth function

$\begin{gathered} N(t)=23900(1.00984)^t \\ N(15)=23900(1.00984)^{15} \\ N(15)=27700\text{ (nearest hundred)} \end{gathered}$

Hence, the population is 2022 is 27700 (nearest hundred)

8 0

1 year ago

Solve the equation. 8x2 – 4 = 28

Flura [38]

Hello,

Your answer would be 2, -2.

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$8x^2-4+4=28+4$

$8x^2 = 32$

$\frac{8x^2}{8}= \frac{32}{8} 
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$x^2 = 4$

x = +/4

x = 2 or x = -2

2 , -2 would be the answer! :)

Mark Brainliest if this helped you :)

4 0

3 years ago

Read 2 more answers

What is the measure of the third angle in the similar triangles below?

WARRIOR [948]

Answer:

65

Step-by-step explanation:

We know that,

The Sum of all angles of the triangle is 180°.

As given in the question,

Triangle PQR is similar to Triangle WXY

Therefore ,

Let the third angle be 'x'.

35° + 80° + x = 180°

115 + x = 180°

x = 180° - 115°

x = 65°.

Hence, 65° is the appropriate answer to the question.

I hope my answer helped!!

7 0

3 years ago