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4 years ago

How do i do this ? I am so confused

Mathematics

1 answer:

Elanso [62]4 years ago

3 0

Add all of the statistics together, divide 5 by that total, then multiply that by 100.

(5 divided by 26) (which is the total) to get ).192 times 100.

The final answer is 19.2%

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Someone please help me find the exterior angle

CaHeK987 [17]

Answer:

(4× +6)° =+24° =102°+24° = 126°= x=126°

5 0

3 years ago

Three cards are drawn from a standard deck. What is the probability that all three are hearts, given that at least two of them a

bogdanovich [222]

Answer:

1/3 I believe because we already know 2 of them are hearts

Step-by-step explanation:

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3 years ago

The perimeter of a rectangle is 72. The width is 4 less than the length.

likoan [24]

Answer:

The perimeter =72

The width = 16

The length = 20

Step-by-step explanation:

.A rectangle has 4 sides , so 72 divided by four is 18. The question is that the width is 4 less than the length. The difference between the length and the width is 4 so increase the length by 2 and decrease the width by 2. Now the numbers obtained are 16 ( 18 decreased by 2) and 20 (18 increased by 2). It is mentioned in the question that the width is less and length is more.

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3 years ago

The Jenkins family and the Alexander family each used their sprinklers last summer. The water output rate for the Jenkins

garik1379 [7]

Answer:

Jenkins: 25 hours Alexanders: 20 hours

Step-by-step explanation:

To solve this problem we need to set up two equations. We know the rates of each sprinkler's output and how much total water was output. We know how many hours the sprinklers were on. We are looking for how long each sprinkler was used.

We can make a represent hours because we know the rate of sprinkler's output is per hour.

25a+40b=1425

a+b=45

Now to solve this system of equations we need to isolate a variable on one equation to plug into the other.

a+b=45

a=45-b

Now we can plug this in for a in the other equation.

25a+40b=1425

25(45-b)+40b=1425

Distribute 25 into the parenthesis.

1125-25b+40b=1425

1125+15b=1425

15b=300

b=20

Now we know that the Alexander family used their sprinklers for 20 hours. We can plug this back into the other equation to find b.

a+b=45

a+20=45

a=25

The Jenkins used the sprinklers for 25 hours, and the Alexanders used them for 20 hours.

3 0

3 years ago

A rectangular prism has a width of 16 inches and a length of 10 inches. The volume of the rectangular prism is decreasing at a r

frosja888 [35]

Answer:

-3.47 inches per minute

Step-by-step explanation:

Let the height be 'h' for any time 't'.

Given:

Length of the prism (L) = 10 in

Width of the prism (w) = 16 in

The rate of change of volume of prism is, $\frac{dV}{dt}=-555\ in^3/min$ (The negative sign implies the volume decreases with time.)

Now, rate of change of height of prism = $\frac{dh}{dt}=?$

Length and width remains constant.

Now, we know that, volume of a rectangular prism is given as:

Volume = Length × width × Height

$V=Lwh\\\\V=10\times 16\times h\\\\V=160h$

Now, differentiating both sides with respect to time 't', we get:

$\frac{dV}{dt}=\frac{d}{dt}(160h)$

Plug in the given values and solve for $\frac{dh}{dt}$ . This gives,

$-555=160\times \frac{dh}{dt}\\\\\frac{dh}{dt}=\frac{-555}{160}\\\\\frac{dh}{dt}=-3.47\ in/min$

The negative sign implies the height decreases with time.

Therefore, the the rate of change, in inches per minute, of the height when the height is 3 inches is -3.47 inches per minute.

5 0

3 years ago