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2 years ago

Can someone help me with 3 and 4?

Mathematics

1 answer:

KIM [24]2 years ago

8 0

Answer:

3) $f(-11)=2(-11)-7\\f(-11)=-22-7\\f(-11)=-29$

4) $g(21)=6(21)-3\\\\g(21)=126-3\\g(21)=123$

Step-by-step explanation:

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12'<br>Given that tan x =<br>sin x + cos x?<br>î, what is the value of<br>(WAEC]

Andre45 [30]

Answer:

$\tan(x) = \sin(x) + \cos(x)$

Sorry but your question is not too explanatory but I sure hope this helps

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2 years ago

The number of trees in a rainforest decreases each month by 0.5%. The forest currently has 2.5 billion trees. Which expression r

Blababa [14]

Answer:

$y=2.5*10^9(0.005^{12 0}) \\\\$

Step-by-step explanation:

The above question is in the form of an exponential decay. The equation for an exponential decay is given by:

$y=ab^x$

where y and x are variables, b < 1, a is the initial value of y (that is the value of y when x = 0).

Let y represent the number of trees left and x represent the number of months. Given that there is currently 2.5 billion trees, therefore a = 2.5 * 10⁹, b = 0.5% = 0.005. The equations becomes:

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2 years ago

Sin α = 21/29, α lies in quadrant II, and cos β = 15/17, β lies in quadrant I Find sin (α - β).

Sever21 [200]

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

$\sin\alpha=\dfrac{21}{29}\implies \cos^2\alpha=1-\sin^2\alpha=\dfrac{400}{841}$

Since $\alpha$ lies in quadrant II, we have $\cos\alpha$ , so

$\cos\alpha=-\sqrt{\dfrac{400}{841}}=-\dfrac{20}{29}$

$\cos\beta=\dfrac{15}{17}\implies\sin^2\beta=1-\cos^2\beta=\dfrac{64}{289}$

$\beta$ lies in quadrant I, so $\sin\beta>0$ and

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2 years ago

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Answer:

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Step-by-step explanation:

The meaning of "solution to the system of equations" is that both lines intersect at the solution point. That is, they both pass through that point.

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