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3 years ago

What is the sign of the product?

2 answers:

8 0

$= (0.3)(-9.2)(-8.1)(4.2)(-0.8) \\ = (-2.76)(-8.1)(4.2)(-0.8) \\ = (22.356)(4.2)(-0.8) \\ = (93.8952)(-0.8) \\ = -75.11616$

So, yeah the product is Nagative.

KengaRu [80]3 years ago

7 0

The simplest way is to count the number of NEGATIVE SIGNS in the problem before doing any multiplying If there are an ODD number of NEGATIVE TERMS the answer is NEGATIVE if an EVEN NUMBER the answer is POSITIVE In this problem there are 3 negative terms, so the answer is NEGATIVE after knowing the sign, just multiply the numbers without worrying about the sign, you already know it

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If a snowball melts so that its surface area decreases at a rate of 3 cm2/min, find the rate at which the diameter decreases whe

tensa zangetsu [6.8K]

Answer:

The diameter decreases at a rate of -0.0477 cm/min when it is 10 cm.

Step-by-step explanation:

Surface area of a snowball:

A snowball has a spheric format, which means that it's surface area is given by:

$A = 4\pi r^2$

In which r is the radius, which is half the diameter. In function of the diameter, the area is given by:

$A = 4\pi(\frac{d}{2})^2 = \pi d^2$

Solving the question:

To solve this question, we have to implicitly derivate the area in function of t. So

$\frac{dA}{dt} = 2d\pi\frac{dd}{dt}$

Snowball melts so that its surface area decreases at a rate of 3 cm2/min

This means that $\frac{dA}{dt} = -3$

Find the rate at which the diameter decreases when the diameter is 10 cm.

This is $\frac{dd}{dt}$ when $d = 10$ . So

$\frac{dA}{dt} = 2d\pi\frac{dd}{dt}$

$-3 = 20\pi\frac{dd}{dt}$

$\frac{dd}{dt} = -\frac{3}{20\pi}$

$\frac{dd}{dt} = -0.0477$

The diameter decreases at a rate of -0.0477 cm/min when it is 10 cm.

5 0

3 years ago

A group of five will rent a car for a spring break trip and divide the costs associated with the car among them. The rental cost

xenn [34]

Answer:

i really dont know

please explain the question more

Step-by-step explanation:

7 0

3 years ago

A sector with a radius of 15 cm has a central angle measure of 8pie/5

Citrus2011 [14]

Answer:

The area of the sector is $180\pi \ cm^2$ .

Step-by-step explanation:

We have,

Radius of circle is 15 cm

Central angle is $\dfrac{8\pi}{5}\ \text{radian}$

It is required to find the area of the sector. The formula used to find the area of sector is given by :

$A=\dfrac{1}{2}r^2\theta$

Plugging all the values in above formula as :

$A=\dfrac{1}{2}\times 15^2\times \dfrac{8\pi}{5}\\A=180\pi \ cm^2$

So, the area of the sector is $180\pi \ cm^2$ .

3 0

3 years ago

A school allots £3000 to spend on a trip to the theatre. Theatre tickets have a regular cost of £40 each and are on offer for 1

Bumek [7]

Answer:

£36

Step-by-step explanation:

From the question, we are told that School allots £3000 to spend on a trip to the theatre. With regular cost of tickets of £40 each with offer for 1/5 off

Then the cost of each ticket with 1/5 off= (4/5×40)= £32

From the question, A train ticket for the day will cost £20 each.

Then total cost for each of it = £32+£20

=£52

To determine how much money that the school will have left over, If 3 teachers and the maximum number of students attend, can be expressed below by first calculating the number of students.

Let us denote the number of students as "x"

52(x+3)= < 3000

52x + 156 =< 3000

52x =< 3000 - 156

52x =< 2844

X =< 2844/52

s =< 54.69,

The max. Number of students is 54

Total number of people= Number of students + the 3 teachers

= 54+3= 57

Total cost for 57 people= (£52 × 57 people)= £2964

The amount of money the school will have as left over = (£3000 - £2964)

= £36

8 0

3 years ago

One store sells milk for $3.00 per gallon. A second store sells milk for $0.80 per quart. Formulas If you need two gallons, whic

Darya [45]

Answer:

You should buy from the first store

Step-by-step explanation:

Since there are 4 quarts in a gallon, we will need to multiply .80 by 8 to figure out how much it costs for 2 gallons. This will be $6.40 for the second store, and in order to find out how many the first store offers, we multiply 3 by two, which is six.

So, the first store charges $6.00 for two gallons, and the second store does $6.40 for two gallons of milk

8 0

3 years ago

Read 2 more answers