Y-5b

evaluate the expression when b= -3 and y=5

20

Step-by-step explanation:

all you need to do is substitute the variables into the given expression, y-5b would turn into 5-5(-3) then you solve and you get 5-(-15) = 5+15 = 20, so youre answer is 20

75

Step-by-step explanation:Hey there! So we know what to substitute for the letters. Our new equation should look like this: 5(-5)(-3). By using PEMDAS, we should first multiply 5 by -5, which is -25. Our equation now should look like this: -25(-3). Since they are right next to each other, you have to multiply them. When you multiply two negative numbers, they turn out to be positive. Your answer should be positive 75

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: