Let Q= the number of quarters and D= the number of dimes.
Q+D= 40 coins
0.25Q+0.1D= $7.75
Rewrite equation 1 as: D = 40-Q and substitute into equation 2
0.25Q+0.1(40-Q)= 7.75 Simplify the left side
0.25Q+4-0.1Q= 7.75 Subtract 4 from both sides
0.25Q-0.1Q= 3.75 Convime like terms on left side
0.15Q= 7.75 Divide both sides by 0.15
Q=25 and D= 40-Q
D= 40-25 which is 15
So Jenna had 25 quarters and 15 dimes.
<span>To check multiply 25 x 25 and 15x10 which equals 625 and 150 this equals 775 so this is 7.75</span>
Answer:
1. (2/3, -2)
2. (-3/2, 3)
3. (9/4, 3)
4. (4/5, -1)
5. (doesn't show the question, ill answer if u tell me what it is)
6. (4/3, 4)
7. (-3, 3/2)
8. (-2, 3)
9. (3, -2)
10. (doesn't show the question, ill answer if u tell me what it is)
Step-by-step explanation:
I'm a master at graphing :3. Also just if you forgot or don't know it's like (x, y). Hope I helped :)
Answer:
8.5 x 10 ^4 for 85 000
6.7 x 10 ^-6 for 0.0000067
Step-by-step explanation:
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The difference between two numbers is 12. Three times the larger number is seven times the smaller. What are the two numbers?
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JEEW-M  | CERTIFIED EDUCATOR
Let us say the two numbers are x and y and x>y.
The data we have are;
Difference between the numbers are 12.
3 times larger number is equal to 7 times smaller number.
Then we can write;
 ----(1)
 ----(2)
From (1) we can say 
Then substituting  to (2) gives;




Then;


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