Question

Can soemone please explain how to do this please

Answer 1

Answer:

9.    -5.83.

10.    5 3/10

Step-by-step explanation:

9.   -4.35 - 1.48

Suppose these are  degrees celsius below zero. The - 1.48 takes the temperature down further and the number part gets  higher. We are 'adding' a negative to get another negative.

So it is   -4.35 - 1.48 = -5.83.

10. 1  4/5 - (-3 1/2)

= 1  4/5  - 1 * -3 1/2       Note:  a - times a - = + so we have

1  4/5 + 3  1/2

= 1 + 3+ 4/5 + 1/2

= 4 + 8 /10 + 5/10

= 4 +  13/10

= 4 + 1 + 3/10

= 5 3/10

Answer 2

Answer:

9.   -5.83

10.   5 3/10

Step-by-step explanation:

The problems are trying to determine mastery of dealing with double negative expressions.    On the number line, subtracting an amount from negative 4.35 will make the number larger (more negative) which will be farther towards the left of Zero.  

The second problem is similar, but requires that the student understands converting fractions to the same denominator too.

1 4/5 - (-3 1/2) = ?

Least Common Denominator of 5 and 2 is 10

1 8/10 - (-3 5/10) =?

Convert each term to new base

(10/10 + 8/10)  - [-(30/10 + 5/10)] = ?

Combine whole number and fractional parts

18/10 - (-35/10) = ?

subtracting a negative number converts to positive operator

18/10 + 35/10 = ?

Sum numerators, denominators stay the same.

53/10 = ?

Convert improper fraction back to a whole number and remainder

Answer 5 3/10