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Trava [24]
2 years ago
12

VERY EASY 7TH GRADE QUESTION FIRST ANSWER IS BRAINLIEST

Mathematics
1 answer:
nadezda [96]2 years ago
4 0

Answer:

A. \:  \boxed{ 5c - 5 = 45 }

Step-by-step explanation:

let \: the \: cost \: of \: thier \: meal \: be \:  \to \: c \\ then \to \\ the \: five \: of \: them \: will \: cost \: 5c \\ assuming \: he \: also \: ordered : it \: would \: had \: \\  been \: 5c = 45 \\   \boxed{but \: no}\\ since \: he \: did \: not \: oder \: but \: eat \: the \: rest \: \\  of \: the \: meal \to \\ the \: equation \: is \: givn \: by \to \\ \boxed{ 5c - 5 = 45}

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2. Carissa also has a sink that is shaped like a half-sphere. The sink has a volume of 2000/3 pi in^3 . One day, her sink clogge
gayaneshka [121]
Yes, your answers are correct.

The volume of a cone is given by V = 1/3πr²h.  Since the diameter of the first cone is 4, the radius is 2; therefore the volume is

V = 1/3π(2²)(8) = 32π/3

We divide the volume of the sink, 2000π/3, by the volume of the cone:

2000π/3 ÷ 32π/3 = 2000π/3 × 3/32π = 6000π/96π = 62.5 ≈ 63.

The diameter of the second conical cup is 8, so the radius is 4.  The volume then is:

V = 1/3π(4²)(8) = 128π/3

Dividing the volume of the sink, 2000π/3, by 128π/3:

2000π/3 ÷ 128π/3 = 2000π/3 × 3/128π = 6000π/384π = 15.625 ≈ 16
7 0
3 years ago
4q^2 - (qr + 25) if q = 6 and r = 19
djverab [1.8K]
Answer: 5

Explication: Do PEMDAS first solve the parenthesis which is 6x19= 114 then add the 25 which equals 139. Now slice the exponent 6^2=36 then multiply by 4 which equals 144. Subtract 144-139 and you get 5
7 0
2 years ago
Given: &lt;1 congruent to &lt;2<br>prove: AB is congruent to CB​
Viktor [21]

Answer:

Because 3 and 2 are vertical angles

Step-by-step explanation:

Vertical angles are always equal or congruent

8 0
3 years ago
Does the system have one solution, no solution, or infinitely many? Use your substitution to justify your answer
Taya2010 [7]

Answer: It has one solution. The solution is (x,y) = (-4,-3)

Add up the equations doing so straight down

x + -x = 0x = 0 so the x terms go away

2y + 2y = 4y

-10 + (-2) = -12

We end up with 4y = -12 so y = -3 after you divide both sides by 4. Use this y value to find the value of x

x+2y = -10

x + 2(-3) = -10

x - 6 = -10

x = -10+6

x = -4

The single solution is (x,y) = (-4,-3)

As a check, plug this solution into each equation to see if you get a true statement or not. Let's do so with the first equation

x+2y = -10

-4 + 2(-3) = -10

-4 - 6 = -10

-10 = -10 .... true

and then the second equation

-x+2y = -2

-(-4) + 2(-3) = -2

4 - 6 = -2

-2 = -2 .... true

both equations are true, so the solution is confirmed

4 0
2 years ago
Please help with math problem​
scoundrel [369]

Answer:

From least to greatest:

-2, 0.2, 1/2

Step-by-step explanation:

-2 is below 0. 0.2 is below 1/2 (0.5) and 0.5 is the highest.

6 0
2 years ago
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