A pencil at a stationery store costs $1, and a pen costs $1.50. Shawn spent $12 at the store. He bought a total of 9 items. Which system of equations can be used to find the number of pencils (x) and pens (y) he bought?

Answers

Answer 1

Answer: x= 3 pencils 3+6=9 items
y= 6 pens
So, Shawn bought 3 pencils and 6 pens. 1 pen equals 1.50 and a pencil only costs a dollar and he spent 12 dollars so now if he bought 6 pens and 3 pencils that would equal 12.

Answer 2

Answer: 9x=£9. 9y=13.50. It has to be an even number of y or you will get a decimal and 12 is not a decimal. 7x+2y=£10 5x+4y=£11. 3x+6y=£12 The answer is three pencils and 6 pens.

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The air in a tire pump has a volume of 1.50 L at a temperature of 5.00ºC. If the temperature is increased to 30.0 ºC and the pressure remains constant, what is the new volume? Do not forget to convert ºC to K.

Answers

Answer:

The new volume is 1.63 L

Step-by-step explanation:

A tire pump has a volume of 1.5 L, while the temperature is 5 °C When the temperature changes to 30 °C, the volume will change as well.

The pressure remains constant.

Since the pressure is constant we can use the following formula:

V1/T1 = V2/T2

V1 = the initial volume = 1.5L

T1 = the initial temperature = 5 °C = 273.15 + 5 = 278.15 K

V2 = the final volume = TO BE DETERMINED

T2 = the final temperature = 30 °C = 273.15 + 30 = 303.15 K

1.5L/ 278.15 Kelvin = V2/303.15 K

V2 = (1.50L * 303.15 Kelvin) / 278.15 Kelvin = 1.63 L

When the temperature increased from 5°C to 30°C, the volume will change to 1.63 L

A 12-inch diameter pizza is sliced into sixths. What's the area of one slice?

Answers

find area then divide by 6
area=pir^2

d=2r
d/2=r
d=12
12/2=6=r

area=pi6^2
area=36pi
divide by 6 to find sixths
36pi/6=6pi

area=6pi in^2
if aprox pi=3.14 then
area=18.84 in^2

Find the area of the triangle

Answers

32.2490309931942 so 32

The sentence 3+(5+2)=(5+2)+3 illustratesA: the commutative property of addition.
B: the associate property of addition.
C: the distributive property of multiplication over addition.
D: the additive identity element.

Answers

B: The associate property of addition.

Answer:

Its B

Step-by-step explanation:

That deserves Brainliest

3. Which one doesn't belong? Give a reason why each square does not belong.B. 20%
A. 15%
D. 110%
C. 8%

Answers

Answer:

C. 8%

Step-by-step explanation:

Because everyone can get divided by 5 equally besides 8

Which options could be the next step in simplifying this expression?27 + (3 + 41)

Choose exactly two answers that are correct.

A.

27 + 44 (use order of operations)

B.

30 + 68 (use the distributive property)

C.

30 + 41 (use the associative property)

D.

68 + 30 (use the commutative property

Answers

The correct answer is A and C. In PEMDAS, parenthesis are the first things that need to be simplified. And the associative property states a (b + c) = (a + b) + c. And you can also add up the numbers in the answer choice to make sure :)

$Associative\ property:a+(b+c)=(a+b)+c\n\n27+(3+41)=(27+3)+41=30+41=71\leftarrow\boxed{C}$

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