Answer:
6×(7+13)-50= <u>70</u>
Step-by-step explanation:
First, solve the problem inside the parenthesis.
6×20-50
Now, multiply 6 times 20.
120-50
Subtract to get the final answer.
120-50= 70
Answer: D)3.5h+4
Step-by-step explanation:
Let h denotes the number of hours that the ice skates are rented.
Since, The cost of renting ice skates is $4 plus $3.50 for each hour that the ice skates are rented.
So , the total cost for ice-skating = $4 + $3.50 x (number of hours that the ice skates are rented.)
= 4+3.50 x ( h) [as expression]
Hence, the expression can be used to find the cost in dollars of renting ice skates for h hours :-

Answer:
Step-by-step explanation:
Given that a statistics student would like to estimate the average age of students at her college.
Population std dev =2.5years
For 99% , Z critical = ±2.59
Margin of error = 
Simplify to get

n = 167.70
n=168
She must survey 168 people
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