I need to know what the answer to this question is

A

Step-by-step explanation:

8*a*10⁻²=b*10⁻³

8*a*10⁻²=10b*10⁻²

cancel out 10⁻² by dividing both sides by it.

8a=10b

Use trial error.

A. a=3.1 and b=2.5

   8*3.1=24.8 (round up to 25)

   10*2.5=25

Option A is closest. I tried all options.

x + 3y = 460 ( this is the statement for total amount of money)

x + y = 100 ( this is the statement for number of tickets sold)

now use either equation to solve for y, it just happens that x + y = 100 is the easiest to do this with,

this gives use the answer,

y = 100 - x

now plug this into our money equation and you get,

5x + 3(100-x) = 460

now simplify,

5x + 300 - 3x = 460

2x = 160

x = 80

Therefore, 80 ticketStep-by-step explanation:

75 tickets have been sold so far.

step-by-step explanation:

in this question it is clearly mentioned that 45 children's tickets have been sold and this number is 60% of the total tickets sold.

now let's assume the total number of tickets sold be x.

then 60% of x = 45

⇒

⇒ x(.6) = 45

by dividing with .6 on both the sides of the equation

⇒ x = 75

therefore 75 tickets have been sold so far.

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: