8 + 3b= -13
-8. -8
3b= -21
Divide by 3
B= -7
20x^2+50 = -40x^2+110x [ Taking x as the unknown positive integer ]
Answer:
surface area we can also take it as total surface area
9 is the radius and 5cm is the height . as they asked total surface area we have to take the area of base so tht we can make it as
total surface area = csa of cylinder + area of base
we know that,
2pirh+pir²
pir(2h+r)
pir(2×5+9)
pir(10+9)
pir(19)
22/7×9×19
3762/7
=> 537.42 cm² is the answer.
If the numbers supposed to be multiplied together the answer is 7.82 x 10^14
