The total cost C of electricity for a particular light bulb varies jointly as the time t that the light bulb is used and the cost w per kilowatt-hour, and C=12c when t=50 hours and w=6 per kilowatt-hour. Find C to the nearest cent when t=30 hours and w=8c per kilowatt-hour.

step-by-step explanation:

use pothagarean therom

a^2+b^2=c^2 so first ac

acm is a right triangle because c= 90°

and am (the hypotenuse or c) =16+9 =25

but there is not enough info we need another angle or side length

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d

the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x

oof

step-by-step explanation: