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cecem58
29.10.2020 •
Mathematics
Note: it is not the second answer.
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Ответ:
fourth option
Step-by-step explanation:
In a right triangle with legs x ( horizontal leg) and y ( vertical leg) and hypotenuse r, then
sinθ =
= ![\frac{y}{r}](/tpl/images/0851/8869/28238.png)
Ответ:
d=number of dimes
total number is 19 so
q+d=19
value of coins is 0.25 for each quarter and 0.1 for each dime
value=valuequarters+valuedimes
4=0.25q+0.1d
the system of equations is
q+d=19
0.25q+0.1d=4
for ease, multily second equation by 10
2.5q+d=40
multiply first equation by -1 and add to this new equation
-q-d=-19
2.5q+d=40 +
1.5q+0d=21
1.5q=21
divide both sides by 1.5
q=14
sub back
q+d=19
14+d=19
mnus 14
d=5
5 dimes
14 quarters