9/10 ÷ 2/5 = 9/10 x 5/2 = 9/2 x 1/2 = 9/4
Y = sit ups, x= days
y= 2x + 15
33 = 2x + 15 (subtract 15 from both sides)
18 = 2x (divide both sides by 2)
9 = x, 9 days
So let's check 8 for example:
step 1: (x^4 + 19^3 + 108x^2 + 236x + 176) - x^3(x-8) =
27x^3 + 108x^2 + 236x +176
step 2: (27x^3 + 108x^2 + 236x + 176) - 27x^2(x-8) =
324x^2 + 236x + 176
step 3: (324x^2 + 236x + 176 ) - 324x(x-8) = 2812x + 176
step4: 2812x + 176 - 2812(x-8) = 2812*8 + 176
which is not zero.
actually you can see that all your answers A - D are incorrect, because the coefficients of the equation are all positive, so the if x is positive the value of the equation is also always positive.
This equation can have only negative roots (if it has any)
Answer: (-3 , 10)
Step-by-step explanation:
<span>They show as many digits as possible instead of using significant figures</span>