Can someone check these for me?
For 1 and 2 write the expression as a single logarithm.
1. 2 logbs+8 logbt
My answer: logb(q^2t^8)

2.4 log x - 6 log (x+2)
a. 24 log x/x+2
b. logx^4(x+2)^6
c.logx(x+2)^24
d. none of these (my answer)

3. Expand the logarithmic expression log5 7a^3
my answer: 7 log5 a^5

4. Use the change of Base Formula to evaluate log2 74
My answer: 1.869

Question

Can someone check these for me?
For  1 and 2 write the expression as a single logarithm.
1. 2 logbs+8 logbt
My answer: logb(q^2t^8)

2.4 log x - 6 log (x+2)
a. 24 log x/x+2
b. logx^4(x+2)^6
c.logx(x+2)^24
d. none of these (my answer)

3. Expand the logarithmic expression log5 7a^3
my answer: 7 log5 a^5

4. Use the change of Base Formula to evaluate log2 74
My answer: 1.869