<span>3x+ 2y+7 -5x+7y
= -2x + 9y + 7
hope it helps</span>
Answer: 
Step-by-step explanation:
Let be "x" the time in minutes a 150-pound person must walk at 4 mph to use at least 190 calories.
The amount of calories that a 150-pound person uses in 1 minute when walking at a speed of 4 mph is:

Therefore, knowing this, we can write the following proportion:

Finally, we must solve for "x" in order to find its value.
Multiplying both sides of the equation by 190, we get this result:

Answer:
ummmmmm peace out
Step-by-step explanation:
V=πr^2h/3=π·3^2·11.5/3≈108.38495 or 108.40 rounded
Answer:
The x-intercept is (-2,0)
Step-by-step explanation: