Math Question.!?

Question

1. Express -15/32 in decimal form.
A. -0.465625
B. -0.46725
C. -0.46875
D. -0.46915

2. Express 2.3999999999999_as a fraction
A.71/30
B.23/10
C.12/5
D.34/15

Answer 1

1. C --- I just used a calculator

2. C --- 2.399999999999999=2.4, so it is 12/5

(b/c .99999999999999=9/9=1)

Answer 2

-15/32 = -0∙46875 (c).

12/ 5 = 2∙4 (c). This is the closest to the given decimal.

Answer 3

For #1 i guess simply doing the division will help you.
For #2 i will teach you a way that you will never ever forget:

2.39999999 is the question. lets say it's value is X.

which is the part that repeats? the 999999 part. we need to isolate it to be on the right side of the decimal point (.) like this:
10X = 23.999999 it is always a multiple of 10 because we are simply moving the decimal point.
now we need to find one more occurrence of 999999 left alone on the right.
100X = 239.9999999 right?

100X =239.9999
10X = 23.9999
-----------------------
90X = 216 => X = 216 / 90 = 12 / 5

if you had 2.07123123123123 we would solve it like this:
seeing 123 is the part repeating i need to isolate it
100X = 207.123123
and to get one more instance 100`000X = 207123.123123
i did this by taking the decimal point one level inside the decimal.
100`000X = 207123.123123
100X = 207.123123
-----------------------------------------
99900X = 206916 and so on...

Answer 4

Q.1-C
Q.2-Also C

Answer 5

- 15/32 = - 0.46875

- - - - - - - - - - -s-

Answer 6

c & c