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STatiana [176]
3 years ago
6

1/5(2x-10)+4x=-3(1/5x+4) What is x?

Mathematics
1 answer:
SVEN [57.7K]3 years ago
6 0
\frac{1}{5} (2x-10)+4x = -3( \frac{1}{5}x+4)\\\\ \frac{2x}{5} -2 +4x = \frac{-3x}{5} -12\\\\ 4 \frac{2x}{5} -2 = \frac{-3x}{5} -12\\\\ 5x -2 = -12\\\\ 5x = -10\\\\ x = -2
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Elk middle school has 264 students. There are 84 students in the eighth grade. There are 22 fewer seventh-grade students than si
Vinvika [58]

Answer:

There were 84 students in 6th grade, 68 in 7th grade, and 90 in 8th grade.

Step-by-step explanation:

Given that Elk middle school has 264 students, and there are 84 students in the eighth grade, and there are 22 fewer seventh-grade students than sixth-grade students, to determine how many students there are in each grade, the following calculation must be performed:

(264 - 84) / 2) - 22 = X

(180/2) - 22 = X

90 - 22 = X

68 = X

6th grade = 84

7th grade = 68

8th grade = 90

Therefore, there were 84 students in 6th grade, 68 in 7th grade, and 90 in 8th grade.

3 0
3 years ago
A waitress earned $7 per hour at her job plus an additional $50 in tips on Friday. She earned more than $99 total. Which inequal
aivan3 [116]

Answer:

Step-by-step explanation:

7h + 50= 99

99-50 =49

7h=49

49/7

h=7

here's the steps i don't know which part you need

5 0
3 years ago
What is x? -8=-(x+4)
Lena [83]

Answer:

x=4

Step-by-step explanation:

3 0
3 years ago
COMPLETE<br> The equation X-9=0 has how many <br> real solution(s).
Maru [420]

Answer:

one solution

Step-by-step explanation:

X-9=0

Add 9 to each side

X-9+9=0+9

x = 9

There is one solution

5 0
4 years ago
Within 11 years, the age of Peter will be half the square of the age he was 13 years ago. Calculate the current age of Peter. Re
OLga [1]

Answer:

21

ctto JBarnum

Step-by-step explanation:

P+11=(1/2)(P-13)^2

P+11=(1/2)(P^2-26p+169)

2(P+11)=(1/2)(2)(P^2-26p+169)

2P+22=P^2-26p+169

0=P^2-28p+147      ( -7 and -21)

(P-7)(P-21)=0

P=7,21                     (cant be 7 as 13 years from 7 is negative so peter is 21)

checking:

21+11=32

32=(1/2)(21-13)^2

32=(1/2)(8)^2

32=(1/2)64

32=32

correct

4 0
3 years ago
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