Solve for x. 3(x + 5) - 2(x + 2) = 20

2 answers:

7 0

Well, we'll use the distributive property whenever x by itself is being added/subtracted to another number and a number is outside the parentheses :P.

3(x + 5) ------> 3 times x + 3 times 5 -----> 3x + 15.

2(x + 2) ------> 2 times x + 2 times 2 -----> 2x + 2

Now once you get all the variables on the left side of the equation and the positive numbers on the right side of the equation, x = 9. To check, just type this problem into an algebraic calculator and you'll get the same results! c:

IRINA_888 [86]3 years ago

4 0

[tex] 3(x + 5) - 2(x + 2) = 20 \\
3x + 15 - 2x - 4 = 20\\
5x + 11 = 20\\
5x = 9\\
x = 1\frac{4}{5} [tex]

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The length of a pencil is measured with two rulers. Report the length of the pencil from each ruler with the proper number of di

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Length measured using Ruler A= 1.17 dm

Length measured using Ruler B=1.18 dm

Step by Step Explanation:

I have added the missing photograph which shows the length of pencil being measured with two rulers.

Ruler A has marking separated by 1 dm

Ruler B has marking separated by 0.1 dm

Length measured using Ruler A= 1.17 dm

(As we can see I have added the middle markers, we can see the tip of pencil is somewhere between 1 and 1.25, it is more than 1.125 but lesser than 1.25, it is somewhere around 1.2 and 1.125 dm, approximately equal to one half of 1.25 which is 1.125 with addition of one of the three halves of half of 1.125 which is 1.125+0.045 dm hence 1.17dm)

Length measured using Ruler B=1.18 dm

(we can see the tip of pencil is just before 1.2 dm, it is clear that the value is precisely 1.18 and not 1.19 dm)

Tip:Always measure one more decimal than given by the ruler when unsure about the exact value