At the market, 5 light bulbs cost $9
How much do 7 light bulbs cost?

If 5 light bulbs cost $9, then each costs $1.8.

Then 7 light bulbs would cost $12.6.

Step-by-step explanation:

If 5 light bulbs costs $9

1 lights bulb‘s cost is 9 divided by 5.

9 divided by 5 is equal to $1.8

1.8 x 7 = $12.6

answer is 12.6

+25 = x

step-by-step explanation:

here x is the hypotenuse of a right triangle whose legs are 7 and 24.   by the pythagorean theorem, 7² + 24² must equal x²:

x² = 49 + 576 = 625.   thus, x = +√625 = +25 = x

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47