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DerKrebs [107]
3 years ago
5

Every 2 days, Marina spends a total of 5.25 hours baking cupcakes and 4.75 hours decorating the cupcakes. At this rate, what is

the total number of hours that Marina will spend baking and decorating cupcakes in 7 days?
PLS HELP!!! I HAVE A TIME LIMIT
Mathematics
2 answers:
Goryan [66]3 years ago
5 0

Answer:

70

Step-by-step explanation:

Ok so we first add 4.75 and 5.25. 4.75+5.25=10. So 10 hours each day so 10 x 7 = 70. 70 hours in 7 days

dangina [55]3 years ago
5 0

Answer:

i would say it is either 30 or 35

Step-by-step explanation:

7/2=3.5

so you would round it down to 3 or keep it that

and 4.75+5.25=10

3(10)=30 and 3.5(10)=35

If it's every two days.

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A closed-top cylindrical container is to have a volume of 250 in2. 250 , in squared , . What dimensions (radius and height) will
miv72 [106K]

Answer:

radius r = 3.414 in

height h = 6.8275 in

Step-by-step explanation:

From the information given:

The volume V of a closed cylindrical container with its surface area can be expressed as follows:

V = \pi r^2 h

S = 2 \pi rh + 2 \pi r^2

Given that Volume V = 250 in²

Then;

\pi r^2h = 250  \\ \\ h = \dfrac{250}{\pi r^2}

We also know that the cylinder contains top and bottom circle and the area is equal to πr²,

Hence, if we incorporate these areas in the total area of the cylinder.

Then;

S = 2\pi r h + 2 \pi r ^2

S = 2\pi r (\dfrac{250}{\pi r^2}) + 2 \pi r ^2

S = \dfrac{500}{r} + 2 \pi r ^2

To find the minimum by determining the radius at which the surface by using the first-order derivative.

S' = 0

- \dfrac{500}{r^2} + 4 \pi r = 0

r^3 = \dfrac{500 }{4 \pi}

r^3 = 39.789

r =\sqrt[3]{39.789}

r = 3.414 in

Using the second-order derivative of S to determine the area is maximum or minimum at the radius, we have:

S'' = - \dfrac{500(-2)}{r^3}+ 4 \pi

S'' =  \dfrac{1000}{r^3}+ 4 \pi

Thus, the minimum surface area will be used because the second-derivative shows that the area function is higher than zero.

Thus, from h = \dfrac{250}{\pi r^2}

h = \dfrac{250}{\pi (3.414) ^2}

h = 6.8275 in

7 0
3 years ago
Identify the terms and like terms in the expression.<br> 10x2 – y + 12 - 3x2
Alexandra [31]

Answer:

Terms: 10x^2, -y, 12\ and\ -3x^2

Like Terms: 10x^2\ and\ -3x^2

Step-by-step explanation:

Given

10x^2 - y + 12 - 3x^2

Required

List out the terms and like terms

The terms of a mathematical expression:

a + b - c + d are a, b, c and d

Using the same yardstick as above;

The terms of 10x^2 - y + 12 - 3x^2 are

10x^2, -y, 12\ and\ -3x^2

To get the like terms, we look for terms with the same variable

10x^2\ and\ -3x^2 have the same variable of x^2

Hence, they are like terms

6 0
3 years ago
)<br> 1.What is the additive of 3/8
tekilochka [14]

Answer:

3

Step-by-step explanation:

3 + (-8) - (-8)

= 3 - 8 + 8

= 3

6 0
3 years ago
Given m
Lilit [14]

Answer:

x = 41°, y = 139°

Step-by-step explanation:

The given parameters are;

Line <em>m</em> is parallel to line <em>n</em> and lines <em>m</em> and <em>n</em> have a common transversal

The corresponding angles formed by the common transversal to the two parallel lines are 41° on line <em>m</em> and <em>x°</em> on line <em>n</em>

Therefore, x° = 41° by corresponding angles formed between on two parallel lines by a common transversal are equal

x° and y° are linear pair angles and they are, supplementary

∴ x° + y° = 180°

∴ x° + y° = 41° + y° = 180°

y° = 180° - 41° = 139°

y° = 139°.

3 0
3 years ago
For what values of x is -1/2x+6&gt;4x-3
borishaifa [10]

Answer:

x<2

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.

8 0
3 years ago
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