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AnnyKZ [126]
3 years ago
12

Please help me. After charging for 1/3 of an hour, a phone is at 2/5 of its full power. How long will it take the phone to charg

e completely?
Decide whether each equation can represent the situation.

a. 1/3×?=2/5

b. 1/3÷2/5=?

c. 2/5÷1/3=?

d. 2/5×?=1/3​
Mathematics
1 answer:
yanalaym [24]3 years ago
5 0

Answer:

D

Step-by-step explanation:

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Find the height of a rectangular prism if the area of its base is 240 square inches and its volume is 2880 cubic inches.
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Answer:

Step-by-step explanation:

area of base = 240 in²

volume = (area of base)× height

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height = 2880/240 = 12 in

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Step-by-step explanation:

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The answer is B, (8)
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John and Karen plan on building a garden in their new home. They plan on designing a rectangular garden with a perimeter of 70 f
valentinak56 [21]

Answer:

Length of the garden= 7 feet while the width =28 feet

Step-by-step explanation:

Let the length of the garden be L while the width represented as W

From the question, we deduce the following:

W = 4L

Perimeter = 2(L + W) = 70 feet .... substituting W = 4L into this equation gives

70 = 2(L + 4L)

70 = 2(5L)

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7 0
3 years ago
Evalute costheta if sintheta = (sqrt5)/3
torisob [31]

Answer:

\large\boxed{\cos\theta=\pm\dfrac{2}{3}}

Step-by-step explanation:

Use \sin^2x+\cos^2x=1.

We have

\sin\theta=\dfrac{\sqrt5}{3}

Substitute:

\left(\dfrac{\sqrt5}{3}\right)^2+\cos^2\theta=1\qquad\text{use}\ \left(\dfrac{a}{b}\right)^n=\dfrac{a^n}{b^n}\\\\\dfrac{(\sqrt5)^2}{3^2}+\cos^2\theta=1\qquad\text{use}\ (\sqrt{a})^2=a\\\\\dfrac{5}{9}+\cos^2\theta=1\qquad\text{subtract}\ \dfrac{5}{9}\ \text{from both sides}\\\\\cos^2\theta=\dfrac{9}{9}-\dfrac{5}{9}\\\\\cos^2\theta=\dfrac{4}{9}\to \cos\theta=\pm\sqrt{\dfrac{4}{9}}\\\\\cos\theta=\pm\dfrac{\sqrt4}{\sqrt9}\\\\\cos\theta=\pm\dfrac{2}{3}

3 0
3 years ago
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