Answer:
3225
Step-by-step explanation:
The sum to n terms of an arithmetic sequence is
= 
[ 2a + (n - 1)d ]
where a is the first term and d the common difference
here a = 6 and
d = 13 - 6 = 20 - 13 = 7, hence
= 
[ (2 × 6) + (29 × 7) ]
= 15(12 + 203) = 15 × 215 = 3225
hola buenos días tío PEDRO de la Mari pero le
Answer:
Step-by-step explanation:
15 1/2 times 2 1/8 ??
15 ×2 =30 +1 =31/2
2×8=16+1=17/8
527/16
Answer:
0.75 or 3/4 cups
Step-by-step explanation:
Make a proportion
We need 1 1/4, or 1.25 cups of sugar for 20 cookies, and we need x cups of sugar for 12 cookies
1.25/20=x/12
To solve, we need to get the variable,x, by itself. It is being divided by 12. To reverse this, multiply both sides by 12.
12(1.25/20)=(x/12)12
The 12s on the right will cancel, and we are left with
0.75=x
0.75 is equivalent to 3/4
So, 0.75 or 3/4 cups of sugar is needed to make 12 cookies
