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Question Number 9061 by tawakalitu last updated on 16/Nov/16

Commented by tawakalitu last updated on 16/Nov/16

$$\mathrm{please}\mathrm{help}.$$

Answered by mrW last updated on 16/Nov/16

$$\left(1\right)$$$$80\cdot {\left(\frac{1}{2}\right)}^n=2.5$$$${\left(\frac{1}{2}\right)}^n=\frac{2.5}{80}$$$$2^n=\frac{80}{2.5}=32=2^5$$$$n=5$$$$$$$$\left(3\right)$$$$now:son15,father15\times 10/3=50$$$$\frac{50+x}{15+x}=\frac{2}{1}$$$$50+x=30+2x$$$$x=20$$

Commented by tawakalitu last updated on 16/Nov/16

$$\mathrm{i}\mathrm{really}\mathrm{appreciate}\mathrm{sir}.\mathrm{God}\mathrm{bless}\mathrm{you}$$

Answered by mrW last updated on 16/Nov/16

$$\left(2\right)$$$$14\times 17=238{cm}^2$$$$areacutoff:238-108=130{cm}^2$$$$14x+(17-x)x=130$$$$x^2-31x+130=0$$$$(x-5)(x-26)=0$$$$x=5$$$$x=26>14,soitisnosolution.$$$$hencewidthofthestripsis5cm.$$$$thefirststripwas14\times 5=70{cm}^2$$$$thesecondwas12\times 5=60{cm}^2$$$$orthefirststripwas17\times 5=85{cm}^2$$$$thesecondstrip9\times 5=45{cm}^2$$

Commented by tawakalitu last updated on 16/Nov/16

$$\mathrm{wow}.\mathrm{thanks}\mathrm{so}\mathrm{much}\mathrm{sir}.\mathrm{i}\mathrm{really}\mathrm{happy}.$$$$\mathrm{God}\mathrm{bless}\mathrm{you}.$$

Commented by mrW last updated on 16/Nov/16

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