Answer:
23
Step-by-step explanation:
2x+14+x+7=90, 3x+21=90,3x=90-21. 3x=69, x=23
Answer: A
Step-by-step explanation:
A linear function is described as:
https://tex.z-dn.net/?f=f(x)%20%3D%20ax%20%2B%20b
When the value of x = 0, then you're left with
https://tex.z-dn.net/?f=f(x)%20%3D%20b
In this question, the speed of sound is the linear function while the temperature is the independent variable. When T = 0, you're left with
https://tex.z-dn.net/?f=S(0)%20%3D%20331.4
Which means the speed of sound in air when temperature is 0°C is 331.4m/s.
Answer:
12x + 10 = 54 - 10x
12x + 10x = 54 - 10
22x = 44
divide both side by 22
<u>2</u><u>2</u><u>x</u><u> </u>= <u>4</u><u>4</u>
22 22
x = 2
To get miles per hour, divide the miles by the hour = 0.266 or 0.03
4/5 divided by 30(half hour)
I hope that help