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3 years ago

9

Verify cos(180+x)=-cosx Please note the 180 is in degrees.

1 answer:

inna [77]3 years ago

5 0

The angle sum identity for cosine says that

$\cos(180^\circ+x)=\cos180^\circ\cos x-\sin180^\circ\sin x=-\cos x$

because $\cos180^\circ=-1$ and $\sin180^\circ=0$ .

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PLEASE HELP WITH WORK EXPLAINED (WILL GIVE BRAINLEST)

Inessa05 [86]

Ricks sporting good:

100% - 20% = 80% so the basketball is on sale for 80% of the original price so 24.95 x 0.80 = 19.96 ( sale price)

Sports Expert:
100% - 25% = 75%
so the basketball is on sale for 75% of the original price 25.80 x 0.75 = 19.35 (sale price)

19.35 is less than 19.96 so the better deal is from Sports Expert

8 0

4 years ago

William and his three friends went out for lunch. The bill was $34 and they left a 15% tip. They want to split the bill equally.

slavikrds [6]

Answer:

Each person will pay $9.78

Step-by-step explanation:

Given that:

Amount of bill = $34

Tip = 15%

Amount of tip = $\frac{15}{100}*34$

Amount of tip = 0.15 * 34

Amount of tip = $5.10

Amount after bill = 34 + 5.10 = $39.10

Number of people = William + three friends = 4

Per person share = $\frac{39.10}{4}$

Per person share = $9.775

Rounded to two decimal places

Per person share = $9.78

Hence,

Each person will pay $9.78

8 0

3 years ago

Convert 5.82% to an equivalent decimal

lisov135 [29]

5.82% = 0.0582 in decimal form.

7 0

3 years ago

Read 2 more answers

Jan 258:00:56 AM

horsena [70]

Answer:

The equation of the straight line in point-slope form

$y - 4 = \frac{7}{9} (x-0)$

The equation of the straight line

7x -9y +36 =0

Step-by-step explanation:

<u><em>Step(i):-</em></u>

Given that the points (0,4) and (-9,-3)

The slope of the line

$m = \frac{y_{2} - y_{1} }{x_{2}- x_{1} } = \frac{-3-4}{-9-0} = \frac{7}{9}$

<u><em>Step(ii):-</em></u>

Equation of the straight line passing through the point (0,4) and having slope m = 7/9

$y - y_{1} = m (x-x_{1} )$

$y - 4 = \frac{7}{9} (x-0)$

9 y - 36 = 7x

9y = 7x + 36

$y = \frac{7x}{9} +\frac{36}{9}$

Slope - intercept form

$y = \frac{7x}{9} +4$

<u><em>Final answer:-</em></u>

The equation of the straight line in point-slope form

$y - 4 = \frac{7}{9} (x-0)$

The equation of the straight line

7x -9y +36 =0

8 0

3 years ago

the total cost to rent a pontoon boat for h hours can be represented by the expression 30h+65. if brianna can spend a maxium of

Fed [463]

Answer:

4 hours

Step-by-step explanation:

30(4)+65= 185

3 0

4 years ago

Read 2 more answers