book Maths Puzzle Numerical Ability

Hi I am trying to help my daughter with her algebra and i am lost she is having problems in particular with promlems like this


7+11+9
n n 8

dont know how to draw the underline .. thanks for your help

sandy

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book Other Question
graph the linear function 2x+y=15


can you help me solve this question?

and help me ifnd out what the x intercept is and what it represents in this situation

stevani winters Explain the process and show EACH step in the process of simplifying the following problems:
a. sqrt(48m^5/81)
b. sqrt50 + sqrt32 - 2(sqrt8)
c. 3(sqrt12) - 5(sqrt48)