Please help!! David paid $2.85 for a snack using only quarters and dimes. He used 3 more quarters than dimes.
Let d be the number of dimes David used.
Which expression represents the total amount of money David paid in quarters?

David paid $2.85 for a snack with quarters and dimes. He used 3 more quarters than dimes. How many quarters and dimes did he use to pay for ...

1 answer

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1 vote:

here is a little tip you should use always look at the last sentenc

Step-by-step explanation:

d + 3

6 + 3

Step-by-step explanation:

$2.85 = 285 cents

25q + 10d = 285

d + 3 = q

Substitution:

25(d+3)+10d = 285

25d+75+10d = 285

35d = 285 - 75

35d = 210

d = 210/35

d = 6

q = 6+3=9

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m

3/4 ÷ 3/4

step-by-step explanation:

basically divide any proper fraction with itself to fit the criteria.

so if we are using 3/4, then:

3/4 ÷ 3/4 = 1

so 1 is the quotient.

and the numerators for both these fractions is 3.   and if we divide the numerators:

3 ÷ 3 = 1

we see that quotient is equal to our original quotient as well.