1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
muminat
3 years ago
11

John is twice as old as Mary. The sum of their ages is 52. How old is Mary?

Mathematics
2 answers:
Salsk061 [2.6K]3 years ago
4 0
John =2M
M= M
So M+2M=52

2nd choice
tatuchka [14]3 years ago
3 0

Answer:

J = 2M and J + M = 52

Step-by-step explanation:

Let John's age be J

Let Mary's age be M

Now we are given that John is twice as old as Mary

So, John's age = J = 2M

Now we are given that The sum of their ages is 52.

So, J+M=52

Thus the system of equations could be used to solve the problem is  J = 2M and J+M=52

Hence Option B is correct.

You might be interested in
In a group of 50 patrons, 8 patrons like lattes and espressos, 12 patrons like espressos and cappuccino, 9 patrons like lattes a
Dmitry_Shevchenko [17]
I THINK THE ANSWER IS 16 IM NOT 100% sure
8 0
3 years ago
If a is a negative number, then a(1/a) is equal to -1. If a is a negative number and b is a negative number, then product ab is
Firdavs [7]

Both claims are false. In fact, a and \frac{1}{a} are one the multiplicative inverse of the other. This means, by definition of multiplicative inverse, that

a \cdot \dfrac{1}{a} = 1 \quad\forall a \in \mathbb{R}

So, it doesn't matter if a is positive or negative: the multiplication of one number and its inverse will always be 1: for example,

(-2) \cdot \dfrac{1}{-2} = \dfrac{-2}{-2} = 1

Similarly, when you multiply two number, the sign of the product depends on the sign of the factors as follows:

  • (+) \cdot (+) = (+)
  • (+) \cdot (-) = (-)
  • (-) \cdot (+) = (-)
  • (-) \cdot (-) = (+)

So, the multiplication of two negative numbers is a positive number.

8 0
3 years ago
A man that is 6 feet tall casts a shadow 5 feet long. At the same time, a lamppost beside the man casts a shadow 25 feet long. H
Montano1993 [528]

Answer:

The answer to your question is:  L = 30 ft

Step-by-step explanation:

Data

man = 6 ft

man shadow = 5 ft

lamppost shadow = 25 ft

lamppost height = ? = L

Process

                   \frac{6}{5} = \frac{L}{25}

                    L = \frac{6 x 25}{5}

                    L = \frac{150}{5}

                           L = 30 ft

5 0
3 years ago
Help?<br><br> a) 2/10 + 8/100<br> b) 13/100 + 4/10<br> c) 6/10 + 39/100<br> D) 70/100 + 3/10
Leni [432]

\green{––––––––––––––––––––––––––––––}

\huge\red{\boxed{\tt{{«ANSWER»}}}}

  • A) 2/10 + 8/100 = <u>0</u><u>.</u><u>2</u><u>8</u>
  • B) 13/100 + 4/10 = <u>0</u><u>.</u><u>5</u><u>3</u>
  • C) 6/10 + 39/100 = <u>0</u><u>.</u><u>9</u><u>9</u>
  • D) 70/100 + 3/10 = <u>1</u>

<u>\green{––––––––––––––––––––––––––––––}</u>

<em><u>#</u></em><em><u>carry </u></em><em><u>on </u></em><em><u>learning </u></em><u><</u><u>3</u>

5 0
2 years ago
The image of a parabolic lens is traced onto a graph. The function f(x) = (x + 8)(x – 4) represents the image. At which points d
alexandr402 [8]

Answer:

x = -8 and x = 4

Step-by-step explanation:

given

f(x) = (x+8) (x - 4)

recall that at any point on the x-axis, y = 0 [i.e f(x) = 0]

hence to find where the graph crosses the x-axis, we simply substitue f(x) = 0 into the equation and solve for x

f(x) = (x+8) (x - 4)

0 = (x+8) (x - 4)

Hence

either,

(x+8) = 0 ----> x = -8  (first crossing point)

or

(x-4) = 0 ------> x = 4 (second crossing point)

Hence the graph crosses the x-axis at x = -8 and x = 4

7 0
3 years ago
Other questions:
  • 66. Which of the following shows the fractions 11/3 , 25/7 , and 18/5 in order from least to greatest?
    14·1 answer
  • Pleaseeee help!!! I will mark you as brainlinest for correct answer!!!!
    8·1 answer
  • Solve the system using elimination.<br> | 3x – 5y = 7<br> 5x - 2y =-1
    13·2 answers
  • Someone please help me. serious answers only!!!
    12·2 answers
  • A factory has a linear cost function f(x)= ax+b , where b represents fixed costs and a represents the labor and material costs o
    11·1 answer
  • Help please: (n^4)^-3(n^4)^-1
    10·1 answer
  • I need help because I don’t know what they are asking
    8·1 answer
  • -3/5=d- 5/6 is??<br><br>what is the answer?? plz help
    15·2 answers
  • What is equivalent to 1\5
    12·2 answers
  • Waiting for other questions
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!