Answer:
79/10
Step-by-step explanation:
When making an improper fraction, you have to do the number on the outside times the bottom number of the fraction. So 7 x 10 is 70. Then we add the top number of the fraction, 70+9 = 79. You keep the bottom number (10) the same and put 79 on top. Leaving you with 79/10
Answer:
The product is the difference of squares is 
Step-by-step explanation:
Explanation
- The given expression is (m-7)(m+7).
- We have to multiply the given expression.
- Square the first term m. Square the last term 7 .
Answer:
4th option is correct
Step-by-step explanation:
Joel = j, Mark = m, Sandra = s
j + m + s = 120
m = 3j
j = 1/2 s --> s = 2j
plug in (substitute) each letter to make it in terms of only j: j + m + s = 120
j + 3j + 2j = 120
6j = 120
6j/6 = 120/6
j = 20
now plug in for the j & s equation:
s = 2j = 2(20) = 40
Therefore Sandra has 40 coins!
