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romanna [79]
4 years ago
8

2. Evaluate the expression for a = –1 and b = 5. Show your work. 5a – 7b + b2

Mathematics
1 answer:
pishuonlain [190]4 years ago
3 0
5(-1)-7(5)+(5)2

-5-35+10

-40+10

= -30
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Please need help :) Math
o-na [289]
(y-k)²/a² + (x-h)²/b² = 1
Vertices being : A(0,1) & B(0, - 9), means that h=0

Let's calculate k: Af₁ + Af₂ = |2+8| = 2a = 10 → a=5 (f₁ and f₂ = focii)
1) a = 10 (WRONG) since a =5
2) h=3 (WRONG) since h =0
3) k =0 (WRONG) since k =5
4) b = 4 RIGHT; PROOF:
we know that : c² = a² - b²
c= 3 & a = 5 then → 3² = 5² - b²
9 = 25 - b²
b² = 25-9 = 16 and b = 4
5 0
3 years ago
A system of equations has 1 solution. If 4x - y = 5 is one of the equations, which could be the other equation?
Nuetrik [128]

answer :

A. y = – 4x + 5

Step-by-step explanation:

make y = 4x-5 equal to each of the answer choices and see if you get an answer

STEPS:

1.

make 4x - y = 5 into a y= equation

4x - y = 5 is  y = 4x-5

2.

then make y = 4x-5 equal to each of the answer choices and see if you get an answer

A.

4x-5 = -4x+5

8x = 10

x = 10/8 = 5/4

yes, it has one solution

its also an intersecting line because

one line has 4x and the other has -4x

4x and -4x are slopes and opposite signs so

the lines are intersecting

B.

4x-5 = 4x-5

since they are the same on both sides of the equal sign they have

infinite solutions

they are also both the same line

C.

2y=8x-10 when simplified is y=4x-5

so its just like choice B

they are also both the same line

4x-5 = 4x-5 which is

0 = 0

since they are the same on both sides of the equal sign

infinite solutions

they are also both the same line

D.

-2y=-8x-10 when simplified is y=4x+5

4x-5 = 4x+5 when you work it out you get the answer

0 = 5

since when you solve the equation and get 0 = 5

that means its there is no solution

its also parallel line because both lines have 4x as a slope

brainly.com/question/12706348

8 0
2 years ago
A line is parallel to y = 3x - 12 and
seraphim [82]

Answer:

y=3x-5

Step-by-step explanation:

parallel means that both lines share the same gradient.

from the equation y=3x-12 , we can deduce that the gradient is 3 because it is in the gradient-intercept form

now substitute values into formula

y-y1=m (x-x1)

y--2=3 (x-1)

expand brackets and simplify

y+2=3x-3

subtract 2 from both sides of equation

y=3x-5

6 0
3 years ago
The population of China is 1,352,600,000 and the US is 327,200,000. How many more people are living in China than the US.
777dan777 [17]

Answer:

1,025,400,000

Step-by-step explanation:

I hope this helped!

5 0
3 years ago
Find the indicated arc length. 11/6
soldi70 [24.7K]

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5 0
3 years ago
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