2007-08-12 23:17:43 · 14 answers · asked by Melissa 2 in Science & Mathematics ➔ Mathematics
7t - 21 + t + 4 = 15
8t = 15 + 21 - 4
8t = 32
t = 4
2007-08-16 21:26:46 · answer #1 · answered by Como 7 · 0⤊ 0⤋
(7t - 21) + (t + 4) = 15
Eliminate the brackets,
7t - 21 + t + 4 =15
8t = 32
t = 4
To verify the answer, substitute t = 4 into the question, which is
( 7(4) - 21) + ( 4 + 4) = 15
(28 -21) + 8 = 15
7 + 8 =15 (answer confirmed)
2007-08-13 08:06:20 · answer #2 · answered by 痴心情长剑 3 · 0⤊ 0⤋
Dear Friend,
Hare Krsna,
Here goes the solution. Its quite easy ...
(7t - 21) + (t + 4) = 15
Or 7t - 21 + t + 4 = 15 (Open the brackets and rewerite the statement)
Or 7t + t - 21 + 4 = 15 (Arrange the terms)
Or (7t + t) + (-21 + 4) = 15 (Again bracket them according to grouping)
Or 8t + (-17) = 15 (Calculate the brackets)
Or 8t = 15 + 17 (Shifting the sides)
Or 8t = 32
Or t = 32/8
Or t = 4 -----> Answer.
Hope this solves the problem
Happy Computing
Take Care
keep Smiling and be happy
Hare Krsna
2007-08-13 06:29:45 · answer #3 · answered by keep_smiling_n_be_happy 2 · 0⤊ 0⤋
(7t - 21) + (t + 4) = 15
Remove the parenthesis:
7t - 21 + t + 4 = 15
Group items with like signs:
8t - 17 = 15
Transfer - 17 to the other side with 15 and change it's sign from - to +.
8t = 15 + 17
8t = 32
t = 32 / 8
t = 4
Answer: t is 4
Prove the equality of the sides of your equation by substituting t with 4:
(7[4] - 21) + (4 + 4) = 15
(28 - 21) + 8 = 15
7 + 8 = 15
15 = 15
This proves the sides to be equal and therefore we're quite sure that t as 4 is accurate.
2007-08-17 02:28:56 · answer #4 · answered by Jun Agruda 7 · 3⤊ 0⤋
t = 4
2007-08-13 06:37:15 · answer #5 · answered by VISHAL A 2 · 0⤊ 0⤋
(7t-21)+(t+4)=15
7t-21+t+4 = 15
8t-17 = 15
8t = 15+17
8t = 32
t = 32/8
t = 4
2007-08-13 06:27:24 · answer #6 · answered by fofo m 3 · 1⤊ 0⤋
group like terms 7t+ t -21 +4 = 15
8t - 17 = 15
add 17 to both sides 8t = 32
divide by 8 t = 4
2007-08-13 06:25:55 · answer #7 · answered by country bumpkin 1 · 0⤊ 0⤋
very easy
you have 7t-21 and t+4 = 15
combine them together and you have
7t -21+ t+4=15
now add the Ts together and you have
8t-21+4=15
add the numbers together
8t-17=15
so add 17 on both sides
you have
8t-17+17=15+17
or
8t+0 (-17+17=0) =32
8t=32
t=32divided 8=4
t=4
easy, no?
2007-08-13 06:31:32 · answer #8 · answered by Hamada 2 · 0⤊ 0⤋
Step 1
You can't simply anything with the parenthesis, so drop them.
Step 2
Simplify down and you will get
8t-17=15
Step 3
Add 17 to both sides
8t-17+17=15+17
8t=32
Step 4
Divide both sides by 8
8t/8=32/8
Step 5
Solve
t=4
Step 6
Check, replace t with 4.
(7*4-21)+(4+4)=15
(28-21)+(8)=15
7+8=15
2007-08-13 06:29:34 · answer #9 · answered by tmc0037 3 · 0⤊ 0⤋
(7t-21)+(t+4)=15
1- we arrange the like terms together:
7t + t = 15 + 21 -4
8t = 32
2- we divide by 8 to get (t) by its own
therefore
t = 32/8
= 4
2007-08-13 06:27:23 · answer #10 · answered by DeSeRT EaGLe 1 · 1⤊ 0⤋