The total bill for a dinner, before tax, is $40.00. if you leave a 15% tip, you will leave a tip of $?

$6.00

A fairly easy way to do the mental calculation of a 15% tip is to realize that ...

... 15% = 10% + (1/2)·10%

Of course, you can compute 10% by moving the decimal point 1 place left, so ...

... 10% of $40.00 = $4.00

Half that is $2.00, so the 15% tip is $4.00 +2.00 = $6.00.

let's solve your equation step-by-step.

4x+2=2x+12

step 1: subtract 2x from both sides.

4x+2−2x=2x+12−2x

2x+2=12

step 2: subtract 2 from both sides.

2x+2−2=12−2

2x=10

step 3: divide both sides by 2.

2x

2

=

10

2

x=5

step-by-step explanation:

94

step-by-step explanation:

average the numbers and use a variable to figure out the minimum to get a 90.

(79+94+91+92+x)/5=90

x = 94