Question

whats the value of the expression

-2/5 - (3/7) x (7/10)

Answer 1

\[-\frac{ 2 }{ 5 }-\frac{ 3 }{ 7 }\times\frac{ 7 }{ 10 }\]

Answer 2

i dont know :(

Answer 3

Lets do the first two fractions first.
Make the denominators the same.

\[\frac{ 2 }{ 5 }\times \frac{ 7 }{ 7 }\] \[\frac{ 3 }{ 7 }\times \frac{ 5 }{ 5 }\]
Tell me what you get for each after multiplying.

Answer 4

2/5 x 7/7= 0.4

3/7 x 5/5 = 0.42857142857 ???

Answer 5

No.
\[2\times7=14\]\[5\times7=35\]
\[3\times5=15\]\[7\times5=35\]
Now: \[\frac{ 14 }{ 35 }\] and \[\frac{ 15 }{ 35 }\] are your new fractions.

Answer 6

Remember, the first fraction is still a negative. Now that the denominators are the same, subtract 14-15 and keep the denominator the same.

Answer 7

14-15= -1

Answer 8

Good! So now your new fraction is \[-\frac{ 1 }{ 35 }\]

Answer 9

Do you know how to multiply two fractions with different denominators?

Answer 10

\[-\frac{ 2 }{ 5 }-\left(\frac{ 3 }{ 7 }\times\frac{ 7 }{ 10 }\right)\] solve the stuff in parenthesis first since you're multiplying it.

Answer 11

Oh ^ Okay.