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serious [3.7K]
3 years ago
15

1. Add or subtract. Show your work for each problem.

Mathematics
1 answer:
Aleks04 [339]3 years ago
4 0
Hi there!

a. 8x^2 - 1
(x^2 - 4x + 5) + (7x^2 + 4x - 6)
= x^2 + 7x^2 - 4x + 4x - 1
= 8x^2 - 1

b. 5x^2 + 7x - 7
(7x^2 + 4x - 6) - (2x^2 - 3x + 1)
= 7x^2 + 4x - 6 - 2x^2 + 3x - 1
= 7x^2 - 2x^2 + 4x + 3x - 6 - 1
= 5x^2 + 7x -7

Hope this helps!
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2. Find the value of x. Then, find the measure of each angle. H 3X-2 <br>I 4x-9 <br>J 3x-9​
Alisiya [41]
The correct answer js 7 i think
7 0
3 years ago
Read 2 more answers
Please help with number 5. Just ignore the pink pen :)
german

Answer:

The answer is option c

4 0
3 years ago
The length of a ribbon is 3/4 meter. Sun yi needs pieces measuring 1/3 meter for an art project. What is the greatest number of
omeli [17]
You need to DIVIDE the 3/4 meter into 1/3 meter pieces, so....
(3/4)÷(1/3) = (3/4) *(3/1) = (9/4) = 2.25
She can cut 2 (1/3) meter pieces.
To find what is left subtract (2/3) from the original (3/4).
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5 0
3 years ago
The population (in millions) of a certain country t years after 1900 is given by the function p(t). There were 420 million in 19
gladu [14]

Answer:469 million

Step-by-step explanation:

Given

The population of a country at t=1900 is 420 million

and P'(t) is a constant therefore P(t) is a linear function of time

assuming P(t)=7t +c

at t=0 i.e. 1900 at starting Point P(t)=420 million

i.e.

420=7\times 0+c

c=420 million

Thus at\ t=7\ year\ later\ i.e.\ 1907

P(t)=7\times 7+420=469 million

Thus at 1907 Population is 469 million

P'(t)=7 indicates that growth rate of Population is constant equals to 7 billion

8 0
3 years ago
What is the equation of a line that crosses the y axis at (0,-3) and has a slope of 4?
MAXImum [283]
Hi dear,

use this formula:

y - y1= m(x-x1)

Y1 = -3
X1 = 0
m = 4

y-(-3)=4(x-0)

y+3=4x

y=4x-3
8 0
3 years ago
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