Answer:
-10xsquared-x+38
Step-by-step explanation:
so,
general eqn of quadratic equation is,
axsquared+bx+c=y
where,
x and y are exchanged by coordinates given in qn
1,64a-8b+c=0
2,4a-2b+c=0
or c=2b-4a
60a-6b=0
3,36a-6b+c=8
32a-4b=8
Answer:

Step-by-step explanation:
Recall that the volume of a whole sphere is given by the formula:

then, the volume of a semi-sphere would be half of the formula above:

Now, the radius R is given by half of the semi-sphere diameter: 15/2 = 7.5 cm.
which makes our calculation:

12%=(3+10%*x)/(20+x)
x=30
add 30 pounds of the second alloy
Answer:
Substitution
Step-by-step explanation:
We know that B equals five, and that a + b = c. This means that if we substitute 5 for b, the equation will still be true. Hope this helps!