28 books. 59(current books) - 31(past books) equals the amount of books Sandy bought, which is 28 books. Hope it helped
I think that either A or B have to be the number of days
Answer:I got 18.28
Step-by-step explanation:
so for getting the perimeter, you only need the outer line, so you sum the measurements you have for the rectangle: 1+2+2+7= 12. After that you need the circumference of the circle, you can figure it out by using the formula C = 2pi(r) You can find the radius by substracting the known sides of the rectangle attached to the circle from the bottom base and then dividing it in 2, leaving us with a radius of 2. Then we input values; C=2pi(2) which equals 4pi, but we need to divide that in half since it’s only half a circle. That leaves us with 2pi, or 6.28. Then we add the perimeter of the square, which was 12, and 6.28+12= 18.28
Answer:
the second option
Step-by-step explanation:
in ax²+bx+c = 0:
![x = \frac{-b+-\sqrt{b^2-4ac} }{2a}](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%7B-b%2B-%5Csqrt%7Bb%5E2-4ac%7D%20%7D%7B2a%7D)
subtract both sides by 6 to get to this form, as the right side will be left with 0
6x² + 8x - 6 = 0
here, the coefficient for x² (a) is 6, the coefficient for x (b) is 8, and the remaining number added on (c) is -6
plugging our numbers into the formula, we get
![x = \frac{-8+-\sqrt{(-8)^2-4(6)(-6)} }{2(6)}\\= \frac{-8+-\sqrt{64-(-144)} }{12} \\= \frac{-8+-\sqrt{208} }{12} \\ = \frac{-8+\sqrt{208} }{12} or \frac{-8-\sqrt{208} }{12}\\= 0.53518375848 or -1.86851709182\\= approximately -1.87, 0.54](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%7B-8%2B-%5Csqrt%7B%28-8%29%5E2-4%286%29%28-6%29%7D%20%7D%7B2%286%29%7D%5C%5C%3D%20%5Cfrac%7B-8%2B-%5Csqrt%7B64-%28-144%29%7D%20%7D%7B12%7D%20%5C%5C%3D%20%5Cfrac%7B-8%2B-%5Csqrt%7B208%7D%20%7D%7B12%7D%20%5C%5C%20%3D%20%5Cfrac%7B-8%2B%5Csqrt%7B208%7D%20%7D%7B12%7D%20or%20%5Cfrac%7B-8-%5Csqrt%7B208%7D%20%7D%7B12%7D%5C%5C%3D%200.53518375848%20or%20-1.86851709182%5C%5C%3D%20approximately%20-1.87%2C%200.54)