Following the 2:1 ratio for studying is a strategy for using which principal of memory

answer for #1 is c

answer for #2 is d

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answer:

step-by-step explanation:

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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c.

step-by-step explanation:

substitution for (0,1)

y=x^2+4x+1

1=0^2+4(x)0+1

1=0+4(x)0+1

1=4(x)0+1

1=0+1

1=1

substitution for (-3,-2)

y=x+1

-2=-3+1

-2=-2