Answer: -11 meters
Step-by-step explanation:
so for the waters surface, we are going to call that 0. if bob is at 15 meters below 0, then -15+4=-11, so he would be at-11 meters in relation to the waters surface.
 
        
             
        
        
        
Answer: He can predict that 420 students will be in support of the purchase.
Step-by-step explanation:
 Since Randy surveyed one student out of every 5 he came across in the cafeteria, it means that if he came across five people, he will survey one, if he came across ten students, he will survey 2 and so on.
 If then he surveyed a total of 140 students, then we can actually multiply the number by 5 to know the exact number of students he possibly came across in the cafeteria:
 = 140 × 5
 = Total of 700 students
 If 84 out of the surveyed students supported the purchase, we can find what that figure represents in the total number of students in the cafeteria:
 84/140 = x/700
 We cross multiply
 140 × X = 84 × 700
 140X = 58,800
 X = 58,800/140
 X = 420 students
 Therefore, he can predict that 420 students out of a total of 700 students in the cafeteria will be in support of the purchase of the P.E equipment
 
 
 
        
             
        
        
        
Part A: 47 x 38 + 47 x 62. You have to do your order of operations first. 47 x 38 is 1786. 47 x 62 is 2914. 2914 + 1786 is 4700, your answer. 
Part B: 752 + (467+248) = 752 + (715)=1467.
        
             
        
        
        
6 is 5.5 because the length of GH is half of KL