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3 years ago

Evaluate -6(x - 2y) when x = -3 and y = -5

Mathematics

1 answer:

Galina-37 [17]3 years ago

8 0

Substitute the value of the variable into the expression and simplify.

-42

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The length of a rectangle is 3ft less than double the width, and the area of the rectangle is 14ft^2 find the dimensions of rect

german

Answer: $4\times 3.5\ ft^2$

Step-by-step explanation:

Given

area of the rectangle is $A=14\ ft^2$

Suppose width is given by w

So, length is $l=2w-3$

The area of a rectangle is $A=l\times w$

putting values

$\Rightarrow A=(2w-3)w\\\Rightarrow 14=2w^2-3w\\\Rightarrow 2w^2-3w-14=0\\\Rightarrow 2w^2-7w+4w-14=0\\\Rightarrow w(2w-7)+2(2w-7)=0\\\Rightarrow (2w-7)(w+2)=0\\\\\Rightarrow w=\dfrac{7}{2}\ ft$

length is $l=4\ ft$

6 0

3 years ago

15 decreased by twice a number x in algebriac expression

postnew [5]

2x - 15

15 is decreased that is the key word here which indicates subtraction.

twice a number with given variable x is 2x

subtraction always goes behind so 2x - 15

4 0

3 years ago

Your beginning balance on your lunch account is $42. You buy lunch for $1.80 every day and sometimes buy a snack for $0.85. Afte

tangare [24]

Answer:

The answer to your question is: I bought 7 snacks

Step-by-step explanation:

Data

beginning balance = $42 = b

lunch = $1.80 = l

snack = $ 0.85 = s

final balance = $0.05 = f

f = b - 1.8l - 0.05s

0.05 = 42 - 1.8l - 0.85s

After 20 days I spent = 1.8(20) in lunches = $36

0.05 = 42 - 36 - 0.85s

0.05 = 6 - 0.85s

0.05 - 6 = -0.85s

-5.95 = -0.85s

s = -5.95/-0.85

s = 7

4 0

3 years ago

What is the image of A under the translation described by the translation rule (x, y)--->(x + 4, y - 10)?

Mademuasel [1]

Translation rule (x, y)--->(x + 4, y - 10)

Object A = (5, 6)

Apply rule:

(5, 6)---->(5 + 4, 6 - 10) = (9, -4)

Image A' = (9, -4)

Option 3: (9, -4) is the answer

6 0

3 years ago

What is 7/8 divided by 6/13 in the simplest form.

Arte-miy333 [17]

Answer:

The answer is: 1 43/48

~hope this answered your question correctly, have a gr8 day my friend!~

Step-by-step explanation:

3 0

3 years ago