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3 years ago

Need answer plz help

Mathematics

1 answer:

Lena [83]3 years ago

8 0

Answer:

138.16

Step-by-step explanation:

multiply them all together

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The distance around the lake is 0.75 mile.derek ran 0.8 of the distance on monday . how far did he run? the answer is 0.75 * 0.8

Elanso [62]

$0.75*0.8= \frac{75}{100} * \frac{8}{10} = \frac{75*8}{100*10} = \frac{600}{1000} = \frac{6}{10}=0.6$

5 0

4 years ago

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Suppose the population of a town is 8,200 and is growing 3% each year. Write an equation to model the population growth. Predict

lawyer [7]

x = population after 3 years

y = starting population

r = percentage

n = number of years

x = y *(1+r)^n

x = 8200 * (1 +0.03)^3

x = 8960.36

so about 8960 people in 3 years

6 0

3 years ago

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Solve the system by using a matrix equation (Picture provided)

Katyanochek1 [597]

Answer:

Option b is correct (8,13).

Step-by-step explanation:

7x - 4y = 4

10x - 6y =2

it can be represented in matrix form as $\left[\begin{array}{cc}7&-4\\10&-6\end{array}\right] \left[\begin{array}{c}x\\y\end{array}\right] = \left[\begin{array}{c}4\\2\end{array}\right]$

A= $\left[\begin{array}{cc}7&-4\\10&-6\end{array}\right]$

X= $\left[\begin{array}{c}x\\y\end{array}\right]$

B= $\left[\begin{array}{c}4\\2\end{array}\right]$

i.e, AX=B

or X= A⁻¹ B

A⁻¹ = 1/|A| * Adj A

determinant of A = |A|= (7*-6) - (-4*10)

= (-42)-(-40)

= (-42) + 40 = -2

so, |A| = -2

Adj A= $\left[\begin{array}{cc}-6&4\\-10&7\end{array}\right]$

A⁻¹ = $\left[\begin{array}{cc}-6&4\\-10&7\end{array}\right]$ / -2

A⁻¹ = $\left[\begin{array}{cc}3&-2\\5&-7/2\end{array}\right]$

X= A⁻¹ B

X= $\left[\begin{array}{cc}3&-2\\5&-7/2\end{array}\right] *\left[\begin{array}{c}4\\2\end{array}\right]$

X= $\left[\begin{array}{c}(3*4) + (-2*2)\\(5*4) + (-7/2*2)\end{array}\right]$

X= $\left[\begin{array}{c}12-4\\20-7\end{array}\right]$

X= $\left[\begin{array}{c}8\\13\end{array}\right]$

x= 8, y= 13

solution set= (8,13).

Option b is correct.

3 0

3 years ago

Sasha is 8 years than ei. the sum of their ages is 14. find the ages os sasha and rei

snow_lady [41]

Answer:

<h2><u><em>Rei 3 years old</em></u></h2><h2><u><em>Sasha 11 Years old</em></u></h2>

Step-by-step explanation:

sasha is 8 years than ei. the sum of their ages is 14. find the ages os sasha and rei

(14 - 8) : 2 = 3 (Rei)

8 + 3 = 11 (Sasha)

------------------

11 + 3 = 14

the answer is good

6 0

3 years ago

3,000 is 10 times as much as

nalin [4]

3,000 is 10 times as much as

3000 = 10 times of what number

We need to find 10 times what number gives us 3000

Let the unknown number be x

3000 = 10 times x

3000 = 10x

To solve for x, we divide by 10 on both sides

$\frac{3000}{10}=\frac{10x}{10}$

300 = x

So, the unknown number is 300

3000 = 10 times 300

3000 is 10 times as much as 300

4 0

3 years ago

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