Can u guys help me plssss it’s due tmw

Mathematics

2 answers:

AveGali [126]2 years ago

7 0

I’ll help u because I know it’s probably so hard but I hope u text back

Aliun [14]2 years ago

5 0

A. convert 1 hour, 18 mins, 27 secs to hours.
1+(18÷60)+27÷3,600)=1.3075 hours

26.2 miles in 1.3075= 26.2 miles / 1.3075 hr
= 26.2÷1.3075/1.3075÷1.3075
(divide the numerator and the denominator by 1.3075)

= 20.04/1

B. divide the distance by the average speed to find the time.

30 miles
---------------
20.04 mph ( which equals 1.497 hours)

so it would take 1.5 hours

Hope this helped!

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Nata [24]

Answer:

First image attached

The error was done in Step E, because student did not multiply $2\cdot x -8$ by the negative sign in numerator. Step E must be $\frac{2\cdot x -5}{(x+4)\cdot (x-4)}$ .

Second image attached

The error was done in Step C, because the student omitted the $2\cdot a \cdot b$ of the algebraic identity $(a+b)^{2} = a^{2}+2\cdot a\cdot b +b^{2}$ . Step C must be $5\cdot x = x^{2}+4\cdot x + 4$

Step-by-step explanation:

First image attached

The error was done in Step E, because student did not multiply $2\cdot x -8$ by the negative sign in numerator. The real numerator in Step E should be:

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Hence, Step E must be $\frac{2\cdot x -5}{(x+4)\cdot (x-4)}$ .

Second image attached

The error was done in Step C, because the student omitted the $2\cdot a \cdot b$ of the algebraic identity $(a+b)^{2} = a^{2}+2\cdot a\cdot b +b^{2}$ . Step C must be $5\cdot x = x^{2}+4\cdot x + 4$

And further steps are described below:

Step D

$x^{2}-x+4 = 0$