What is the justification for the step taken from line 2 to line 3?

3x+9-7x=X+10+X

4x+9=2x+10

6x+9 = 10

6x=1

Use the value of the ratio to determine which ratios are equivalent to 7:15 a) 21:45 b) 14:45 c) 3:5 d) 63:135

Use the order of operations to evaluate the expression below. 15 - [14 = (15-8) + 13 - 14 - 10

Which is greater 20 cups or 10 pints

i am measurng two line segments the first line is 30centi meter long the second line segment is 500milli meter how long are the two line segments together answer in cm

There is a bag filled with 5 blue, 2 red and 3 green marbles, A marble is taken at random from the bag, the colour is noted and then it is replaced. Another marble is taken at random What is the probability of getting 2 different colours?

Event A: Spinning violet or yellow on the spinner shown. Event B: Rolling an even number on a number cube. On the Spinner there is red, orange, yellow and violet and on the di the numbers are 1-6

Malory got a 75% on her math test. To earn that score, she got 27 questions correct. Write an equation to find how many questions were on the test. Then solve

Probability With a Pair of Dice: Find the probability of rolling the difference of 1.

1/7 = 3/4x-1 solve for x

12 eggs cost $2.04. How much would 18 cost?