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3 years ago

What’s the answer to this question?

Mathematics

1 answer:

sertanlavr [38]3 years ago

4 0

Answer:

2 equations

28.8/100*75 = $21.6 - 10% 21.6/100*90 = $19.44

Step-by-step explanation:

First one we determine the 25% ans second we deduct 10% from that result.

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Find sin 2a and cot 2a:

geniusboy [140]

Answer:

$sin(2\alpha )=2(\frac{5}{12})(\frac{12}{13})=\frac{10}{13}\\cot(2\alpha ) = \frac{16511}{18720}$

Step-by-step explanation:

$\text{if } cos(\alpha)=\frac{12}{13}\\\text{That must mean we have a triangle with base 12, and hypotenuse 13.}\\\text{Using Pythagoras, we can determine the base of the triangle must be 5.}\\a^2+b^2=c^2 \text{, where c is the hypotenuse and a, b are the two other sides.}\\c^2-b^2=a^2\\\sqrt{c^2-b^2}=a\\\sqrt{13^2-12^2}=\sqrt{169-144}=\sqrt{25}=5\\\text{Therefore, }sin(\alpha) = \frac{5}{12}\\sin(2\alpha)=2sin(\alpha )cos(\alpha)\\\text{(From double angle formulae identities)}\\$

$sin(2\alpha )=2(\frac{5}{12})(\frac{12}{13})=\frac{10}{13}\\cos(2\alpha )=cos^2(\alpha)-sin^2(\alpha)\\cos(2\alpha )=(\frac{12}{13})^2-(\frac{5}{12})^2=\frac{16511}{24336}\\cot(2\alpha)=\frac{cos(2\alpha)}{sin(2\alpha)}=\frac{\frac{16511}{24336}}{\frac{10}{13}}=\frac{16511}{18720}$

8 0

3 years ago

Have a go at this one!

Sonbull [250]

Answer:

I THINK 96

Step-by-step explanation:

11x11=121

5x5=25

121-25=96

7 0

3 years ago

Suppose that l lines are drawn through a circle and these lines form p points of intersection (involving exactly two lines at ea

zhenek [66]

Over which interval(s) is the function decreasing?

8 0

3 years ago

Help plz ASAP !!!!!!!!!!!!!!!!!!!!!!!!!!

Yakvenalex [24]

Answer:

-2

Step-by-step explanation:

Let's solve your equation step-by-step.

−(3v+1)+7(6v+6)=−37

Step 1: Simplify both sides of the equation.

−(3v+1)+7(6v+6)=−37

−3v+−1+(7)(6v)+(7)(6)=−37(Distribute)

−3v+−1+42v+42=−37

(−3v+42v)+(−1+42)=−37(Combine Like Terms)

39v+41=−37

Step 2: Subtract 41 from both sides.

39v+41−41=−37−41

39v=−78

Step 3: Divide both sides by 39.

39v

−78

v=−2

Answer:

v=−2

8 0

2 years ago

Read 2 more answers

Can someone help me write the expression

erica [24]

Answer: 4 1/10g^5+5 1/4

Step-by-step explanation:

8 0

3 years ago