Answer: 5 1/4 miles per hour
Step-by-step explanation:
Divide 15 3/4 (distance) by 3 (hours) and you get 5 1/4 (or 5.25) miles per one hour
Step-by-step explanation:
Should be the third choice
Answer:
39
Step-by-step explanation:
The sum of 34+5 is 39
Let the numbers be x and y. Then xy = -30 and x+y = -3.
Solve xy = -30 for y: y = -30/x
subst. -30/x for y in x+y= -3: x - 30/x = -3
Multiply all 3 terms by x: x^2 - 30 = -3x, so x^2 + 3x - 10 = 0
Solve this quadratic equation for x. x: {-5, 2}
If x = -5, then x+y = -3 becomes -5 + y = -3, and y = 2.
You should check to determine whether x=2 is also correct. If it is, what is the corresponding y value?
8x^2+5x=-3
8x^2+5x+3=0
after solving this u will get x= (- 5(⁺ ⁻)√-71)/16