7. Use the formula d = rt. Find t for r = 46.6 m/h and d = 456.68 m.

A. 9.8 h

B. 0.1 h

C. 410.08 h

D. 21,281 h

A. 9.8 h

Step-by-step explanation:

1. Use the formula d = rt. Find t for r = 46.6 m/h and d = 456.68 m. Show your work.

2. Express 0.578 in words

1. d = rt

456.68 = 46.6 times t

divide both sides by 46.6 to get 9.8  

So the time is 9.8

2. 0.578 is five hundred seventy-eight thousandths

Hope this helps

For the first problem all you have to do is plug in r and d in the equation and solve for t.  So here is how we do that:

d=rt

546.68=46.6t

11.73=t

All we did there was divide both sides to isolate t (get t by itself).

For the second one you just need to know the places after the decimal point.  The first spot is the tenths, the second is the hundredths, and the third is the thousands.  So you would read 0.578 as:

Five-hundred and seventy-eight thousandths.

Substituting:

456.68 = 46.6t, so, dividing ach side by 46.6:

t = 456.68/46.6, so

t = 9.8

2. nought point five seven eight.

the solution is h=10 because you add 9 to each side of the equation.