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Rufina [12.5K]
3 years ago
14

Two times the sum of a number and 4 equals 7.

Mathematics
1 answer:
soldier1979 [14.2K]3 years ago
8 0

Answer:

-1/2 or -.5

Step-by-step explanation:

2(n + 4) = 7

2n + 8 = 7

2n = -1

n = -1/2

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The fifth grade teachers took their classes on a field trip to museum first group had 25 students and two teachers and cost $97.
iren [92.7K]

Answer:


Step-by-step explanation:

S=student cost; T=teacher cost

.

32S+3T=$127 . Multiply this by 2.

64S+6T=$254 Subtract this below

.

25S+2T=$97.50 . Multiply this by 3.

75S+6T=$292.50

64S+6T=$254 . Subtract this (from above.)

.

11S=$38.50

S=$3.50

ANSWER 1: Student tickets cost $3.50.


.

32S+3T=$127

32($3.50)+3T=$127

$112+3T=$127

3T=$15

T=$5.00

ANSWER 2: Teacher tickets cost $5.00.

.

CHECK:

25S+2T=$97.50

25($3.50)+2($5.00)=$97.50

$87.50+$10.00=$97.50

$97.50=$97.50


4 0
3 years ago
Carmen received a gift of $5,000 from her grandmother and decided to invest it. the expression 5000(1.0005)^12t represents the a
Natalija [7]

The equivalent expression for the expression that represents the amount Carmen would earn is 5000(1.0005^12)^t.

<h3>What is the equivalent expression?</h3>

Based on the expression given, Carmen's investment is compounded monthly.

The formula for calculating future value:

FV = P (1 + r)^nm

  • FV = Future value
  • P = Present value
  • R = interest rate
  • m = number of compounding
  • N = number of years

5000(1.0005)^12t

= 5000(1.0005^12)^t

50002.5^12t

Please find attached the complete question.To learn more about future value, please check: brainly.com/question/18760477

7 0
2 years ago
Figure LMNO is a parallelogram.<br> What is the value of x?
galina1969 [7]
Values is 6 for lmso is a parellelle gram
3 0
3 years ago
What is the area of the trapezoid with height 13 units? Enter your answer in the box. units2 A rectangle with a length of 15 and
jolli1 [7]

Answer:

Step-by-step explanation:

Area of the trapezoid = area of rectangle + 2 * area of triangle

Area of a triangle = 1/2 bh

= 1/2 * 13 * 7

= 45.5 units²

Area of a rectangle = L × B

= 15 × 13

= 195 units²

Area of the trapezoid = [195 + 2 * (45.5)]

= 195 + 91

= 286 units²

3 0
3 years ago
Read 2 more answers
Roberta is 20 years older than Julian. In 4 years, Roberta's age will be twice Julian's age.
mars1129 [50]

Step-by-step explanation:

There are 2 questions in one.

1)

<u>Roberta is 20 years older than Julian. In 4 years, Roberta's age will be twice Julian's age:</u>

  • r = j + 20
  • r + 4 = 2j

---------------------------

2)

<u>Roberta is twice as old as David. In 10 years, Roberta will be 8 less than three times David's present age:</u>

  • r = 2d
  • r + 10 = 3d - 8

Correct choice is A

8 0
3 years ago
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