This is an increase and it increased by 40% because the difference between 140 and 100 is 40 which is 40% of 100.
Answer:
y=8(5)^(x)
Step-by-step explanation:
Answer:
46=6+8x
5 friends
Step-by-step explanation:
subtract 6 from 46 to get 40.
divide 40 and 8x by eight to get 5.
Answer:
C
Step-by-step explanation:
The area of the triangle can be calculated using formula
![A=\sqrt{p(p-a)(p-b)(p-c)},](https://tex.z-dn.net/?f=A%3D%5Csqrt%7Bp%28p-a%29%28p-b%29%28p-c%29%7D%2C)
where p is half of the perimeter.
1. If a=19, b=20 and c=21, then
![p=\dfrac{a+b+c}{2}=\dfrac{19+20+21}{2}=30\ m.](https://tex.z-dn.net/?f=p%3D%5Cdfrac%7Ba%2Bb%2Bc%7D%7B2%7D%3D%5Cdfrac%7B19%2B20%2B21%7D%7B2%7D%3D30%5C%20m.)
2. The area is
![A=\sqrt{30\cdot (30-19)(30-20)(30-21)}=\sqrt{30\cdot 11\cdot 10\cdot 9}=30\sqrt{33}\approx 172\ m^2.](https://tex.z-dn.net/?f=A%3D%5Csqrt%7B30%5Ccdot%20%2830-19%29%2830-20%29%2830-21%29%7D%3D%5Csqrt%7B30%5Ccdot%2011%5Ccdot%2010%5Ccdot%209%7D%3D30%5Csqrt%7B33%7D%5Capprox%20172%5C%20m%5E2.)