Answer:
B
Step-by-step explanation:
The rulers tell you the length of the sides
 
        
             
        
        
        
Step-by-step explanation:Let number of 49 cents =A
                                              Let number of 33 cents=B
<u>A+B=45    equation 1</u>
1 $=100 cents 
49 cents =.49 dollar 
33 cents=.33 dollar
so .<u>49A+.33B=17.89    equation 2</u>
Add equation 1 and equation 2
since these are simultaneous equations
.49A+.33B=17.89
      A+     B=45
so divide equation 2 by 100 we get
49A+33B=1789
     A+B     =45 multiply equation 1 by 33 on both the sides we get
<u>33A+33B=1485     equation 3</u>
so subtract equation 3 from equation 2 we get
49A+33B=1789  equation 2
<u>33A+33B=1485    equation 3</u>
<u>16A+0      =304</u>
16A=304
A=304/16
A=19
putting nalue of A in equation 1 we get 
A+B=45
19+B=45
B=45-19
B=26
so number of 49 cent stamps are 19
and number of 33 cent stamps are 26
 
        
             
        
        
        
Step-by-step explanation:
 
        
             
        
        
        
Answer:
They are at the same height at 1.13 seconds.
Step-by-step explanation:
Remark
The rockets are at the same height when  f(x) = g(x) [see below] are the same. So you can equate them.
Givens
f(x) = - 16x^2 + 74x + 9
g(x) = -16x^2 + 82x              I have changed this so you don't have 2 f(x)s
Solution
- f(x) = g(x)
- -16x^2 + 74x + 9 = -16x^2 + 82x                        Add:  16x^2 to both sides
- -16x^2+16x^2+74x + 9 = -16x^2+16x^2 + 82x   Combine terms
- 74x + 9 = 82x                                                     Subtract 74x from both sides
- 74x - 74x + 9 = 82x - 74x                                  Combine
- 9 = 8x                                                                 Divide by 8
- 9/8 = 8x/8
- x = 1 1/8                                                              Convert to decimal
- x = 1.125
- x = 1.13  [rounded]