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Aliun [14]
1 year ago
14

axine spent 15 hours doing her homework last week. this week she spent 18 hours doing homework. she says that she spent 120% mor

e time doing homework this week. is she correct? show your work to justify your decision.
Mathematics
1 answer:
vodka [1.7K]1 year ago
5 0

Answer:

Yes, she is correct. If she did 100% of the work time, it would be 15 hours, so instead of multiplying by 1, we multiply by 1.2. 15 times 1.2 is infact 18. So she is justified in saying that she spent 120% more time this week.

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What is 6x +7=8x -15 solved.
skelet666 [1.2K]

Answer:

11

Step-by-step explanation:

6x+7=8x-15

7=2x+15

22=2x

11=x

6 0
3 years ago
Read 2 more answers
Whoops i forgot to read the lesson :P 30 points
andriy [413]

Step-by-step explanation:

I'll do 2.

Alright,Alex let say we have factored a quadratic into two binomial, for example

(5x + 3)(6x - 4)

If we set both of those equal to zero

(5x + 3)(6x + 4) = 0

We can used the zero product property in this case to find the roots of the quadratic equation.

This means that

if  \: ab = 0 \: then \: a = 0 \: and \: b = 0

This means we set each binomal equal to zero to find it root.

5x + 3 = 0

5x =  - 3

x =  -  \frac{3}{5}

6x + 4 = 0

6x =  - 4

x =  -  \frac{2}{3}

So our roots are negative 3/5 and negative 2/3 using zero product property

6 0
2 years ago
A motor scooter purchased for $1,000 depreciates at an annual rate of 15%. Write an exponential function, and graph the function
Bond [772]
 i suppose that t is an exponent. so let: v(t)=final prize of the scooter...t=time in years.....p=initial prize of the scooter . r= rate of depreciation per year so v(t)=p(1-r)^t....
4 0
3 years ago
A cylinder has a radius of 8 meters and a height of 4 meters. .
Novay_Z [31]
<h2><u>Solution</u> :-</h2>

Given : Radius of cylinder = 8 m

Height = 4 m

Volume of cylinder = πr²h cu. units

= 22/7 × 8 × 8 × 4 m³

= 804.57 m³ (approx.)

Curved surface area = 2πrh sq. units

= 2 × 22/7 × 8 × 4 m²

= 201.14 m² (approx.)

Total surface area = 2πr(r + h) sq. units

= 2 × 22/7 × 8 (8 + 4) m²

= 2 × 22/7 × 8 × 12 m²

= 603.43 (approx.)

4 0
3 years ago
Change 2 hours and 36 mins to a mixed number
defon
You know you have two hours which will be the whole number. Then you take 36min and put it over 60min (total number of min in an hour) and you simplify by 6 to get 6/10 which can be simplified again to 3/5 so your final mixed number is
2 and 3/5 hours
5 0
3 years ago
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