Picture is included please help

Mathematics

1 answer:

devlian [24]3 years ago

3 0

Answer:

B cannot be factored into a perfect square

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A BANK EXCHANGES BRITISH CURRENCY FOR SINGAPORE CURRENCY AT THE RATE OF $3.20 TO £1. CALCULATE IN £ THE AMOUNT EXCHANGED FOR $1,

lapo4ka [179]

Answer: £485

Step-by-step explanation: Given that the rate is $3.20 to £1.

Exchange of $1,600 will be

1600/3.20 = £500

With commission on 3%

3/100 × 500 = 15

Take away £15 from £500

500 - 15 = 485

4 0

3 years ago

Help me please what does y equal ?

kramer

Answer:

y= 5

Step-by-step explanation:

8 0

3 years ago

Help!!!!!!!!!!!!!!!!

kaheart [24]

Answer:

$\cos\alpha\sin\alpha(\cos\alpha-\sin\alpha)$

Step-by-step explanation:

First, simplify each term:

$\sin\left(\dfrac{\pi}{2}+\alpha\right)=\cos \alpha\\ \\\cos \left(\dfrac{\pi}{2}+\alpha\right)=-\sin \alpha\\ \\\cos \left(\alpha-\dfrac{3\pi}{2}\right)=-\sin \alpha\\ \\\sin \left(\dfrac{3\pi}{2}+\alpha\right)=-\cos \alpha$

Then given expression is equivalent to

$\cos ^3\alpha+(-\sin \alpha)^3-(-\sin \alpha)+(-\cos \alpha)\\ \\=\cos ^3\alpha-\sin^3 \alpha+\sin \alpha-\cos \alpha\\ \\=(\cos\alpha-\sin\alpha)(\cos^2\alpha+\cos\alpha\sin\alpha+\sin^2\alpha)-(\cos\alpha-\sin\alpha)\\ \\=(\cos\alpha-\sin\alpha)(1+\cos\alpha\sin\alpha-1)\ \ [\cos^2\alpha+\sin^2\alpha=1]\\ \\=\cos\alpha\sin\alpha(\cos\alpha-\sin\alpha)$