4/5 of 350...." of " means multiply
4/5(350) = 1400/5 = 280 <== Jose payed $ 280
Do the formula length times width times height.
Then, round like you normally would!
And for the second one, just multiply 2.5 x 6!
The length of the support cable is about 29 feet.
If you sketch out the question, you will see that it will form a right triangle with the cable as the hypotenuse.
Just set up and use the Pythagorean Theorem.
15^2 + 25^2 = c^2
850 = c^2
29.15 = c