Ok so, adam had 91 dollars. if he spent 21 dollars on new books, what is the ratio of money he still has, to money he's spent. the answer is 10: 3, but i need a show your work example from somebody! !

Step-by-step explanation:

Let

x ----> the money Adam still has

y ---> the money Adam spent

r ---> the ratio of money he still has, to money he's spent.

we know that

The money Adam still has is the same as the money he originally had minus the money he spent.

so

we have

Find the ratio

Simplify

Divide by 7 both numerator and denominator

the equation cos(35) =a/25 can be used to find the length of bc what is the length of bc? round to the nearest tenth

step-by-step explanation:

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.