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2 years ago

What -4 times 7 on a number line

Mathematics

1 answer:

Julli [10]2 years ago

6 0

Answer:

-28

Step-by-step explanation:

-4(7)=-28

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Yo is this correct? A group of students go out to lunch. If four have burritos and two have tacos, the bill will be $19.00. If t

frez [133]

Answer:

The price of the burrito is $3.5 and the price of the taco is $2.5.

Step-by-step explanation:

2x+5y=19.5

5x+2y=22.5

------------------

5(2x+5y)=5(19.5)

-2(5x+2y)=-2(22.5)

-----------------------------

10x+25y=97.5

-10x-4y=-45

-----------------------

21y=52.5

y=52.5/21=2.5

2x+5(2.5)=19.5

2x+12.5=19.5

2x=19.5-12.5

2x=7

x=7/2=3.5

x=3.5, y=2.5

The price of the burrito is $3.5 and the price of the taco is $2.5.

4 0

2 years ago

A biased dice was rolled and the scores recorded in the table below

dusya [7]

Given:

The table of score and frequency.

To find:

The probability that on the next roll the score will be 4.

Solution:

From the given table it is clear that the score 4 occurs 10 times.

Number of times the dice was rolled = 17 + 24 + 23 + 10 + 16 + 30

= 120

The probability that on the next roll the score will be 4 is

$\text{Required probability}=\dfrac{\text{Number of times 4 occurs}}{\text{Number of times the dice was rolled}}$

$\text{Required probability}=\dfrac{10}{120}$

$\text{Required probability}=\dfrac{1}{12}$

Therefore, the required probability is $\dfrac{1}{12}$ .

8 0

3 years ago

I think of a number double it add 15 my number is 21 what number was i thinking about

AleksandrR [38]

Hello from MrBillDoesMath!

Answer:

Discussion:

Let the number be "n",

2n + 15 = 21 => subtract 15 from both sides

2n = 21 - 15 = 6 => divide both sides by 2

n = 6/2 = 3

Check: Start with 3. Double it (gives 6), add 15 to it ( 6 + 15) which gives 21/

Thank you,

MrB

5 0

3 years ago

Jim would like to create a pencil holder with no top. He would like it to be 5 inches taller and 3 inches wide. He can't decide

irakobra [83]

Answer:

$\$11.13$

Step-by-step explanation:

step 1

Find the surface area of the cylinder

The surface area of the cylinder is equal to

$SA=\pi r^{2} +2\pi rh$

we have

$r=3/2=1.5\ in$ ----> the radius is half the diameter

$h=5\ in$

assume

$\pi =3.14$

substitute

$SA=(3.14)(1.5)^{2} +2(3.14)(1.5)(5)=54.165\ in^{2}$

<em>Find the cost</em>

$54.165*(0.75)=\$40.62$

step 2

Find the surface area of the square prism

The surface area of the prism is equal to

$SA=b^{2} +4bh$

we have

$b=3\ in$

$h=5\ in$

substitute

$SA=(3)^{2} +4(3)(5)=69\ in^{2}$

<em>Find the cost</em>

$69*(0.75)=\$51.75$

step 3

Find the difference of costs

$\$51.75-\$40.62=\$11.13$

4 0

3 years ago

You have three $1 bills, four $5 bills, and two $10 bills in your wallet. You select a bill at random. Without replacing the bil

Mrac [35]

P(5,10)=(4/9)(2/8)

P(5,10)=8/72

P(5,10)=1/9

7 0

2 years ago