I need help with these 2 problems

[MooreC1]

My book says to find s when t=5. I don't know where to start in doing these problems.

t+1=4*the square root of s

t=the square root of -5s + 31

like I said I just don't know where to start.

Any help appreciated.

 

[stapel]

I'm sorry, but your formatting is sufficiently ambiguous as to cloud the meaning. It appears that you have two exercises, each giving a relation between variables "s" and "t", and you are asked to evaluate (find the value of) s when "5" is plugged in for "t".

But I can't tell what the relations are. I think the first one is:

. . . . .t + 1 = 4sqrt(s)

If so, then plug "5" in for "t", add the "1" in, divide through by the "4", and square to find the value of "s".

For the second one, you could mean:

. . . . .t = sqrt(-5)s + 31

...in which case, you'll need to let us know if you're working with complex numbers or only with the reals. Or you could mean:

. . . . .t = sqrt(-5s) + 31

...or:

. . . . .t = sqrt(-5s + 31)

Please reply with clarification. When you reply, please show how far you have gotten on these exercises. Thank you.

Eliz.

 

[MooreC1]

the first one is:

t + 1 = 4sqrt(s)
5 + 1 = 4sqrt(s)
6 = 4sqrt(s)

and the second one is:

t = sqrt(-5s + 31)
5 = sqrt(-5s + 31)

6 = 4sqrt(s) and 5 = sqrt(-5s + 31) is as far as i've gotten in these respectively.

 

[Gene]

A fair start. As Eliz said

then ... divide through by the "4", and square to find the value of "s".

In the next, square both sides and solve for s.