$a_n=a_1+d(n-1)\\\\a_8=a_1+d\cdot7\\\\a_{20}=a_1+d\cdot19\\\\a_{20}-a_8=a_1+19d-(a_1+7d)=12d\\\\56-20=2d\\\\12d=36\\\\d=3\\\\\\ a_1+3\cdot7=20\\\\a_1=20-21=-1$

6 0

2 years ago

Denise makes three times as many chocolate cupcakes as vanilla cupcakes. She also makes three dozen strawberry cupcakes. If Deni

slamgirl [31]

Answer:

6 dozens

Step-by-step explanation:

Vanilla, v = x

Chocolate, c = 3x

Strawberry, s = 3 dozens = 36

Total cupcakes = 132

Hence,

x + 3x + 36 = 132

4x = 96

x = 96 / 4

x = 24

Chocolate = 3 * 24 = 72

Dozens of chocolate = 72 /12 = 6 dozens

7 0

2 years ago

10ft/2in simplified so the units are the same

Roman55 [17]

Answer:

60 inches or 5 feet

step-by-step explanation:
10 ft can be turned into 120 in
120/2
60 inches or 5 feet

4 0

2 years ago

Read 2 more answers

45% grass and the rest paved. how much is paved?

Lana71 [14]

Well we know that total percentages always equals 100 so x + 45 = 100. You should get x = 55%

8 0

2 years ago