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hammer [34]
2 years ago
7

!PLEASE HELP, THANK YOU!

Mathematics
1 answer:
icang [17]2 years ago
5 0

Answer:

D

Step-by-step explanation:

you mean the formula is 4×pi×r² (not 4×pi/r²), right ?

then the correct answer is the sphere (ball).

the surface area of a cylinder is

top and bottom circle area = pi×r² each = 2×pi×r² both

and the mantle is 2×pi×r×height

the surface area of a block has nothing to do with pi.

it is the sum of 6 rectangles.

the surface area of a cone is

A = πr(r + sqrt(h² + r²))

again, also depending on "hight"

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Victoria is counting all of quarters and dimes from the family piggy bank for the month. If there are 12 times as many dimes are
saw5 [17]

Let number of quarters in family piggy bank = x

Let number of dimes in family piggy bank = y


Given that "there are 12 times as many dimes are there are quarters". so we can write equation:

y=12x...(i)


Given that " total change is worth $21.75".

We know that 1 quarter = $0.25 and 1 dime = $0.10

So other equation will be :

0.25x+0.10y=21.75...(ii)

Now we just need to solve both equations.

Plug (i) into (ii)


0.25x+0.10y=21.75

0.25x+0.10(12x)=21.75

0.25x+1.2x=21.75

1.45x=21.75

x=15


plug x=15 into (i)

y=12x=12*15=180


Hence final answer is given as:

Number of quarters in family piggy bank = 15

Number of dimes in family piggy bank = 180



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