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GarryVolchara [31]
3 years ago
10

Your teacher has disabled instant marking. Your marks will appear after the due date.

Mathematics
1 answer:
elena-s [515]3 years ago
4 0

Answer:

Time Duration is 1 hours 35 minutes and 0 seconds

Step-by-step explanation:

Just only subtract the starting time from ending point

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I chose the wrong screenshots for the last one, sorry about that!
Masja [62]
Here you go mate. Look at the attachment

8 0
3 years ago
Read 2 more answers
What are the solutions of the equation x4 - 9x2 + 8 = 0? Use u substitution to solve.
Sedbober [7]

Answer:

\large\boxed{B.\ x=\pm1\ and\ x=\pm2\sqrt2}

Step-by-step explanation:

x^4-9x^2+8=0\\\\x^{2\cdot2}-9x^2+8=0\qquad\text{use}\ (a^n)^m=a^{nm}\\\\(x^2)^2-9x^2+8=0\\\\\text{substitute}\ x^2=t\geq0\\\\t^2-9t+8=0\\\\t^2-t-8t+8=0\\\\t(t-1)-8(t-1)=0\\\\(t-1)(t-8)+0\iff t-1=0\ \vee\ t-8=0\\\\t-1=0\qquad\text{add 1 to both sides}\\t=1\geq0\\\\t-8=0\qquad\text{add 8 to both sides}\\t=8\geq0

t=x^2\to x^2=1\ \vee\ x^2=8\\\\x^2=1\Rightarrow x=\pm\sqrt1\to x=\pm1\\\\x^2=8\Rightarrow x=\pm\sqrt8\to x=\pm\sqrt{4\cdot2}\to x=\pm\sqrt4\cdot\sqrt2\to x=\pm2\sqrt2

4 0
3 years ago
Read 2 more answers
Rashad compiled a list of fixed expenses and noted his total expenses for last month.
Digiron [165]

The equation that represents the variable expences for the february is

x+ $1943.48 = $3,291.74

The linear equation is an equation where highest degree of the variables is 1.

As we know Total expenses include fixed as well as variable expenses.

Total Expenses = Variable Expenses +Fixed Expenses

⇒ Variable Expenses = Total Expenses - Fixes Expenses

Hence to Determine variable expenses Rashad needs we have to subtract his fixed expenses from his total expenses for the month.

Here, given that all February fixed expenses amount are

For rent, expenses are $1,150.00

For car loan expenses are $348.00

For internet, expenses are $46.14

For a student loan, expenses are $399.34

So the total amount of fixed expances are= rent expences+ car loan expences+ internet expences+ student loan expences = $1150+ $348+ $46.14+ $399.34 =$1943.48

Given, The total February expanses are $3,291.74.

Let;s assume the variable expenses is x

As we know

Total Expenses = Variable Expenses +Fixed Expenses

Then the linear equation will be

⇒ x+ $1943.48 = $3,291.74

solving for x i.e. Variable Expenses =  $3,291.74-$1943.48

⇒ Variable Expenses =  $1348.26

Therefore The equation that represents the variable expences for the february is   x+ $1943.48 = $3,291.74

Learn more about the linear equation

here: brainly.com/question/2030026

#SPJ10

7 0
2 years ago
What describes the number and type of the roots of the equation 4x+7=0
Kaylis [27]

Answer:

D : One Real Root

Step-by-step explanation:

Isolate "4x" by subtracting 7 from both sides.

So we get

4x = -7

Then we divide each side by 4 to get -7/4

x = -7/4 so there is only one real root.

5 0
3 years ago
Bonjour j’ai un exercice de maths et je ne comprends rien
Minchanka [31]
Donc pour trouver la réduction de 30% nous allons trouver 30% de 49 alors nous allons faire 30 × 100 × 49 = 14,7 14,7 est la réduction maintenant nous devons faire 49 € -14,7 € soit 34,3 €, le prix est maintenant de 34,3 €, désolé d'utiliser Google Translate pour vous aider, mais j'espère que c'est correct :)
4 0
3 years ago
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