Mark's brother is five years or than mark. thier ages combinded adds up to 23. How old is mark

Mathematics

2 answers:

Serjik [45]3 years ago

7 0

Answer: 15

Step-by-step explanation:

drek231 [11]3 years ago

6 0

Answer:

Step-by-step explanation:

Mark is 18 years old.

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Help

Lubov Fominskaja [6]

Answer:

x=5

Step-by-step explanation:

(8x-8)3/2=64

(24x-8)/2=64 -You are distributing the three

12x-4=64 -You divide the whole thing by two

12x=60 -You subtract the four from both sides

x=5 - You divided the twelve from both sides

Hope this helps!

7 0

3 years ago

Work out 4/5 - 1/5<br> work out 9/11 +5/11 <br> work out 3/4 + 1/8

____ [38]

Answer:

4/5-1/5=6.0

9/11+5/11=1.27

3/4+1/8=0.875

3 0

3 years ago

Write an equation and solve. Round to the nearest hundredth where necessary. What is 35% of 63?

DanielleElmas [232]

22.05

35/100=.35 .35x63=22.05

7 0

3 years ago

Which equation is related to √x+10-1=x ? The square root is over the x+10

Sergio [31]

Answer:

(b) x + 10 = x^2 + 2x + 1

Step-by-step explanation:

The equation can be transformed to one without the radical by isolating the radical and squaring both sides.

$\sqrt{x+10}-1=x\qquad\text{given}\\\\\sqrt{x+10}=x+1\qquad\text{add 1 to both sides}\\\\x+10=(x+1)^2\qquad\text{square both sides}\\\\\boxed{x+10=x^2+2x+1}\qquad\text{eliminate parentheses}$

_____

<em>Additional comment</em>

In typeset formulas, radicals, fraction bars, and superscript formatting serve to group expressions. In plain text, the only available grouping symbol is parentheses.

$\sqrt{x+1}}\ \Rightarrow$ √(x+1)