Mathematics, 21.08.2019 13:10 maddielr17

Explain how you know which coins could be used to show o.77 of a dollar

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The coins you could use to show 0.77 of a dollar ( or known as 77 cents ) are nickels , dimes , pennies or even quarters .

Example 1 : You could use 7 dimes which is 70 cents , 1 nickel which is 5 cents , then add 2 pennies which will add up to 77 cents .

Example 2 : You could use 2 quarters which is 50 cents , 2 dimes which is 20 cents & 7 pennies .

Example 3 : For the really long way , you could just use 77 pennies which will also give you 77 cents .

Example 4 : You could use 1 quarter , 5 dimes , & 2 pennies .

( Note : you must ALWAYS remember the values of coins when doing mathematical problems that's dealing with money )

A Penny : Is Equal To 1 Cent . ( 100 Pennies Make Up A Whole Dollar , 50 Pennies Make Up 50 Cents etc . )

A Nickel : Is Equal To 5 Cents . ( 2 Nickels Makes Up A Dime Which Is 10 Cents , 10 Nickels Makes Up 50 Cents , 20 Nickels Will Make Up A Dollar . )

A Dime : Is Equal To 10 Cents . ( 5 Dimes Is 50 Cents , 10 Dimes Is A Dollar . )

A Quarter : Is Equal To 25 Cents . ( 2 Quarters Is 50 Cents , 4 Quarters Is A Dollar . )

Answer from: Quest

the answer is. -82562234434584

step-by-step explanation:

Answer from: Quest

starting with:

5 + x - 12 = 2x - 7

5 + x - 12 - x = 2x - 7 - x (subtract x from both sides)

5 - 12 = x - 7 (combine and cancel x's from both sides)

5 - 12 + 7 = x - 7 + 7 (add 7 to both sides)

0 = x (add numbers together on both sides)

so in order for the equation to be true, x must be 0.

trying x = -0.5

5 + x - 12 = 2x - 7 (original equation)

5 + -0.5 - 12 = 2(-0.5) - 7 (plug in value of x)

5 + -0.5 - 12 = -1 - 7 (did multiplication)

-7.5 = -8 (did addition on both sides)

since -7.5 is obviously not equal to -8, the value of -0.5 for x is wrong.

trying x = 0

5 + x - 12 = 2x - 7 (original equation)

5 + 0 - 12 = 2(0) - 7 (plug in value of x)

5 + 0 - 12 = 0 - 7 (did multiplication)

-7 = -7 (did addition on both sides)

since -7 equals -7, that demonstrates that the value of 0 for x is correct.

trying x = 1

5 + x - 12 = 2x - 7 (original equation)

5 + 1 - 12 = 2(1) - 7 (plug in value of x)

5 + 1 - 12 = 2 - 7 (did multiplication)

-6 = -5 (did addition on both sides)

since -6 is obviously not equal to -5, the value of 1 for x is wrong.

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