Answer:
.
Step-by-step explanation:
3x - y = 17 .......A
10 × [x/5 + y/2] = 10 × 0
2x + 5y = 0 .......B
......A× 5 both 2 sides of equation
15x - 5y = 85 .....C
......B + ........C
2x + 15x = 0 + 85
17x = 85
x = 85/17
x = 5
put x value in ........A or .......B or ......C
you will receive y = -2
<h3>The formula that correctly relates H and L is H = L + 14.8</h3><h3>The high temperature is 83.7 degrees</h3>
<em><u>Solution:</u></em>
Let H represent the high temperature
Let L represent the low temperature
Given that,
<em><u>The coldest temperature in the city today was 14.8 degrees (Fahrenheit) lower than the hottest temperature</u></em>
L = H - 14.8
Rearrange,
H = L + 14.8
<em><u>If the low temperature was 68.9 degrees, what was the high temperature?</u></em>
L = 68.9
Then,
H = 68.9 + 14.8
H = 83.7
Thus the high temperature is 83.7 degrees
If she went 10 miles upstream in the same time as she went 20 miles downstream, that means the downstream speed is twice the upstream speed.
The speed is still water is 9 mph.
The speed of the current is c.
Going downstream, the current adds speed, so the sped downstream is 9 + c.
The speed upstream is 9 - c.
9 + c is twice 9 - c.
9 + c = 2(9 - c)
9 + c = 18 - 2c
3c = 9
c = 3
Answer: The speed of the current is 3 mph.
Check:
9 + c = 12
9 - c = 6
By taking into the account the speed of the current, the downstream speed, 12 mph, is indeed twice the upstream sped, 6 mph.
Answer:
B. 2⁷
Step-by-step explanation:
Whenever you multiply 2 exponents, you add the powers.
(2³)(2⁴)
3 + 4 = 7
2⁷
Answer:20:18
Step-by-step explanation: