I need some help with Algebra ! I can not figure these equations out!?

Question

10) The body mass index, I , can be used to determine an individual's risk for heart diease. An idex less than 25 indicates a low risk. The body mass index is by formual, or model, I=700W

___________

H2

, where W= weight, in pounds and H= height in inches. Francis weights 180 pounds and stands 69 inches tall. What is his approxiamte body mass index? Find an inequality describing all weights. W that Francis can have and be in the low-risk category. Francis' approximate body mass is ( round to the nearest whole number)

11) Bayside Insurance offers two health plans. Under plan A, Cindy would have to pay the first $180. of her medical bills, plus35% of the rest. Under plan B, Cindy would have to pay the first $190. but only 20% of the rest. For what amount of medical bills will plan B save Cindy money? Assume she has over $190 in bils. Cindy would save with Plan B if she had more than $ in bills.

15) Solve -4<x+5<7 The solution is { x| <x< }

16) -9___<( less then/equal sign)3x-2__< ( less then/ equal sign)-1 The solution is {x|_______<_(less then/equal sign)______ or x__> ( greater then/ equal sign)_______} Type an integer or a frction

27) Graph x+3y____<( less then/ equal sign)

3x+y____< ( less then/equal sign)6

x___>( greater then/ equal sign)0

y___> ( greater then/ equal sign)0

Answer 1

For question 10 you can use the formula with the values given.  So, I = (700*180)/(69*69).  Put that in your calculator and I=26.465.

To solve the inequality look back at the question and see that I must be less than 25.  So that means (700W)/(69*69) &lt; 25.  So 700W &lt; 25*69*69 which further equates to 700W &lt; 119025.  Finally this gets us W&lt;170.0357.  Since this refers to a person&#039;s weight, we can&#039;t have negative values for W, so it is 0&lt;W&lt;170.0357