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zvonat [6]
4 years ago
14

20 feet below sea level positive or negative?

Mathematics
1 answer:
tester [92]4 years ago
6 0
Answer is negative 20
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What's 2+ 8y, 13b+15b, and 20+24ℎ in factored form?
Elanso [62]

Answer:

22+8y+28b+24h

Step-by-step explanation:

combine like numbers

2+20=22

8y=8y

13b+15b=28b

24h=24h

7 0
3 years ago
If sin θ = 2 over 7 and tan θ > 0, what is the value of cos θ?
sashaice [31]
\bf sin(\theta)=\cfrac{opposite}{hypotenuse}
\qquad
cos(\theta)=\cfrac{adjacent}{hypotenuse}
\quad 
% tangent
tan(\theta)=\cfrac{opposite}{adjacent}\\\\
-------------------------------\\\\

\bf sin(\theta )=\cfrac{2}{7}\cfrac{\leftarrow opposite}{\leftarrow hypotenuse}\qquad \textit{let's find the adjacent side}
\\\\\\
\textit{using the pythagorean theorem}\\\\
c^2=a^2+b^2\implies \pm\sqrt{c^2-b^2}=a\qquad 
\begin{cases}
c=hypotenuse\\
a=adjacent\\
b=opposite\\
\end{cases}
\\\\\\
\pm\sqrt{7^2-2^2}=a\implies \pm\sqrt{45}=a\implies \pm 3\sqrt{5}=a

but.... which is it? the + or the -? well, we know that  tan(θ) > 0, is another way to say that the tangent of the angle is positive, now, for the tangent to be positive, since it's opposite/adjacent both opposite and adjacent have to be the same exact sign, now, we know the opposite is +2, so that means the adjacent has to be the same sign, thus is the positive version 3√(5)

thus   \bf cos(\theta)=\cfrac{adjacent}{hypotenuse}\qquad \qquad cos(\theta )=\cfrac{3\sqrt{5}}{7}
3 0
4 years ago
Josh rides his bicycle at a rate of 7 miles per hour. At that rate, how long would it take him to ride 28 miles?
Kay [80]

Answer:

4 hours

Step-by-step explanation:

If Josh goes 7mph and does 28 miles that means we have to divide the total miles he goes, by how much he goes in an how that way we can figure out how long it will take him.

28÷7=4

It will take Josh 4 hours

4 0
3 years ago
Read 2 more answers
How to use transformations to tessellate the regular hexagon ?
inn [45]

Answer:

hexagons are the only regular shapes which tessellate by themselves. You can have other tessellations of regular shapes if you use more than one type of shape. You can even tessellate pentagons, but they won't be regular ones. Tessellations can be used for tile patterns or in patchwork quilts!

8 0
4 years ago
Charlie has $775 saved up.
julia-pushkina [17]

Answer:

y = -50x +775

Step-by-step explanation:

6 0
3 years ago
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