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Fed [463]
3 years ago
11

My teacher wrote the answer on the right but he wants me to show how he did it

Mathematics
1 answer:
Airida [17]3 years ago
4 0

865 is the answer of this question...

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Which is the best description of the equivalency of the two expressions? Expression 1 Expression 2 5 x squared minus 2 x minus 4
lina2011 [118]

Answer:

The correct option is (D).

Step-by-step explanation:

The two expressions are:

\text{Exp}_{1}=5x^{2}-2x-4+6x+3\\\\\text{Exp}_{2}=6x^{2}-6x+6-x^{2}+10x-7

On simplifying both the expressions we get:

\text{Exp}_{1}=5x^{2}+4x-1\\\\\text{Exp}_{2}=5x^{2}+4x-1

Compute the value of both expressions for <em>x</em> = 2 as follows:

\text{Exp}_{1}=5(2)^{2}+4(2)-1=27\\\\\text{Exp}_{2}=5(2)^{2}+4(2)-1=27

The value of both expressions are same for <em>x</em> = 2.

Thus, the correct option is:

"They are equivalent because when x = 2, the two expressions have the same value."

6 0
3 years ago
     Brandon is 6 times as old as Cora. In 4 years, Brandon will be only twice as old as
nalin [4]
C-Cora's\ age\ now\\B-Brandon's\ age\ now\\\\B=6C\ \ \ and\ \ \ B+4=2(C+4)\\\\6C+4=2C+8\\6C-2C=8-4\\4C=4\ \ \ \Rightarrow\ \ \ C=1\ \ \ \Rightarrow\ \ \ \ B=6\cdot1=6\\\\Ans.\ Brandon\ is\ now\ 6\ years.
4 0
3 years ago
Please help !!!!!!!!!
atroni [7]

Answer:

Katherine invested $12,000

Step-by-step explanation:

Use formula

I=P\cdot r\cdot t,

where

I = interest,

P = principal,

r = rate (as decimal),

t = time (in years).

In your case,

t = 1 year,

r = 0.06 (or 6%)

P + I =$12,720, thus

12,720-P=P\cdot 0.06\cdot 1\\ \\12,720-P=0.06P\\ \\12,720=P+0.06P\\ \\1.06P=12,720\\ \\P=\dfrac{12,720}{1.06}\\ \\P=\$12,000\\ \\I=\$12,720-\$12,000=\$720

6 0
3 years ago
Rewrite in simplest terms: 3(q-2r)+6r-8(-6r-2q)3(q−2r)+6r−8(−6r−2q)
Airida [17]

Mom and dad go down

The drain

4 0
3 years ago
Someone could tell me how to identify a direct and inverse proportionality? THANKS, IS IMPORTANT​
stiks02 [169]

Answer:

Directly proportional: as one amount increases, another amount increases at the same rate.

Inversely Proportional: when one value decreases at the same rate that the other increases.

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
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