Answer:
<em>3x</em> - 4
Step-by-step explanation:
As Tina's age is 3 into <em>x</em> ( 3 x <em>x</em><em>=</em> 3x)but 4years less (-4)
Therefore Tina's age is 3x - 4
Answer:
7 hours
Step-by-step explanation:
John already has $100 in his account if he works for 7 hours he will make $85.75 which is more than enough and he will have $185.75. If he worked for 6 hours he will make only $73.50. Which then he will have $173.50. So that is why the answer is 7 hours.
Answer:
D. 
Step-by-step explanation:
First, move the variable (+ 2y) to the left-hand side and change its sign.
Then, move the constant (+ 7) to the right-hand side and change its sign.
Then, collect the like terms (y - 2y)
Finally, add the numbers (3 + 7). That will get you your final answer.
Answer:
(y+1)
Step-by-step explanation:
use quadratic formula.
you will get two values of y
y= 7/5 and y= -1
u can create factors using these values of y (making 0 subject)
like
for 7/5
7/5=y
7=5y
5y-7=0
zero becomes subject in such cases bcz there are no numbers left on that side
now for -1
-1=y
y+1=0
so your factors are 5y-7 and y+1
Answer:
I only see one true equation. Please check the statements.
Step-by-step explanation:
О 0+451=0← for A <u><em>FALSE</em></u>
О 130+210=210+130← for B <u><em>FALSE</em></u>
О (123+57)+180=180+(87+180)←for C <u><em>FALSE</em></u>
√ for= 497+0=497←for D <u><em>TRUE</em></u>
