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olga_2 [115]
3 years ago
13

Mary, who is sixteen years old, is four times as old as her brother. how old will mary be when she is twice as old as her brothe

r? 20 24 25 26 28
Mathematics
1 answer:
mojhsa [17]3 years ago
6 0
Mary<span> is 2x = 2*12 = </span>24 years old<span>.</span>
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3 feet, 9 inches plus 6 feet, 1 inch is equal to 3 yards, 10 inches .. true or false?
Brilliant_brown [7]

Answer:

true

Step-by-step explanation:

8 0
3 years ago
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a shop only buys bananas with the lengths between 13 cm and 20 cm. estimate the fraction of the 80 bananas that the shop buys
ddd [48]

Answer:

44/80

Step-by-step explanation:

draw a line from 13cm upwards to the graph line and then draw a horizontal line from that point to the y axis to find that you get 18 bananas

then draw a line from 20cm upwardsto the graph line and then draw a horizontal line from that point to the y axis to find that you get 62 bananas

62-18=44 you do this because the shop buys banana lengths between 13 and 20

only from 13 to 20 = 44

so out of 80 (the total) it should be 44/80

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3 years ago
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What's the range of 7,5,7,8,6
DanielleElmas [232]

Answer:

3

Step-by-step explanation:

Define the range of a list of numbers.

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8 0
3 years ago
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Is X=[−14−32] the inverse of A=[15−25310−110]?
Elis [28]

The product of the matrices is an identity matrix. Therefore, X and A are inverse of each other.

The matrices are given as:

X = \left[\begin{array}{cc}-1&-3\\4&2\end{array}\right]

A = \left[\begin{array}{cc}\frac 15&\frac 3{10}\\-\frac 25 &-\frac 1{10}\end{array}\right]

To check the matrices are inverse, we calculate their products.

A \times X =  \left[\begin{array}{cc}\frac 15&\frac 3{10}\\-\frac 25 &-\frac 1{10}\end{array}\right] \times \left[\begin{array}{cc}-1&-3\\4&2\end{array}\right]

Multiply the rows of A by the column of X.

This gives

A \times X =  \left[\begin{array}{cc}\frac 15 \times -1 + \frac{3}{10} \times 4&\frac 15 \times -3 + \frac{3}{10} \times 2\\ -\frac 25 \times -1 - \frac{1}{10} \times 4&-\frac 25 \times -3 + -\frac{1}{10} \times 2\end{array}\right]

A \times X = \left[\begin{array}{cc}1&0\\0&1\end{array}\right]

The product of  A and X is an identity matrix.

This means that; both matrix are inverse of each other

Read more about matrix at:

brainly.com/question/4017205

4 0
2 years ago
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Please help! I can't figure this out, i'll give a brainliest
Rus_ich [418]

The linear equation that best fits the data is: y = 10x + 15.

<h3>How to Write the Linear Equation of a Data?</h3>

First, find the slope/unit rate (m) and the y-intercept/starting value, then substitute the values into y = mx + b.

Using two points on the graph, (1, 25) and (2, 35), find the slope (m):

Slope (m) = (35 - 25)/(2 - 1)

Slope (m) = 10/1

Slope (m) = 10

Substitute (x, y) = (1, 25) and m = 10 into y = mx + b to find b

25 = 10(1) + b

25 - 10 = b

b = 15

Substitute m = 10 and b = 15 into y = mx + b

y = 10x + 15

Learn more about the linear equation on:

brainly.com/question/15602982

#SPJ1

3 0
2 years ago
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