Solve for x. 5x2 – 45 = 0

A.
{3}

B.
{3, –3}

C.
{9, –9}

D.
{9}

Answers

Answer 1

Answer: 5x^2-45=0
factor 5 out
5(x^2-9)=0
diff 2 perfec squares
5(x-3)(x+3)=0
set zero
x-3=0
x=3

x+3=0
x=-3

x=-3 or 3

B

Answer 2

Answer: Hi there! 5x²-45=0, add 45 to both sides, 5x²-45+45=0+45=5x²=45. Divide both sides by 5, 5x²/5=45/5, 45/5=9. So, we have x²=9. we have to find the square root of 9. The square root of 9 is 3*3 because 3*3=9. We have two solutions, the first solution is x=3 and the other solution is x=-3. X=3 and x=-3 can be combined and we get {3,-3}. Therefore, your answer is B. {3,-3}

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Answers

Answer:

simplify :

(2+3)² - 16/2 =

5² - 8=

25-8 = 17

Step-by-step explanation:

Answer:

Step-by-step explanation:

(2^2 + 2*2*3 + 3^2) - 16 / 2

25 - 16 / 2

boDmas

first divide 16 by 2 which gives 8

now subtract 8 from 25

answer = 17

You deposit $3000 in a savings account that earns 2.9% annual interest compounded monthly. You also save $80 per month in a safe at home. Write a function for the total amount of money saved C(t)=b(t)+h(t), where b(t) represents the balance of your savings account and h(t) represents the amount in your safe after t years. Round any decimals to three decimal places.

Answers

Answer:

C(t)=3000(1.002417)^12t+960t

if T=1 year then the saving will be : 4048.17

Step-by-step explanation:

3000 deposit amount, 2.9 compound monthly interest . save 80 dollars per month at home .

A=p(1+r)^t

A=3000(1+0.029/12)^12t

A=3000(1.002417)^12t dollars

for the amount saved at home=80*12t=960t dollars

C(t)=3000(1.002417)^12t+960t

if T=1 year then the saving will be :

C(t)=3000(1.002417)^12t+960t

=3088.17+960= 4048.17 dollars

It rained 0.6 inches on Monday on Tuesday it rained 0.2 inches less than Monday how much did it rain on Tuesday?

Answers

If it is 0.2 inches less, just subtract.

0.6 - 0.2 = 0.4

Answer:

0.4

Step-by-step explanation:

The sum of three is 45. The second of the Three numbers is three more than twice the first number X. The third number is two more than the first number X. Which equation can be used to solve for the first number X

Answers

Answer:

see explanation

Step-by-step explanation:

the first number is x

the second number is 2x + 3

the third number is x + 2

sum the 3 numbers and equate to 45

the equation to solve for x is then

x + 2x + 3 + x + 2 = 45 ( simplify left side )

4x + 5 = 45 ( subtract 5 from both sides )

4x = 40 ( divide both sides by 4 )

x = 10

the first number is 10

If a = 3 units, b = 7 units, and c = 10 units, what is the volume of the three prisms above?a 210 cubic units
b 153 cubic units
c 180 cubic units
d 162 cubic units

Answers

First prism= 3*3*3= 27 cubic
Second prism= 7*3*3= 63 cubic
Third prism= 10*3*3= 90 cubic
You add all three cubic together 27+63+90 and you get 180 cubic units
So C.180 cubic units is correct answer
Please mark me as ''The Brainliest Answer" please!!!!!!!!!!!

1. A pair of supplementary angles is shown. One angle measures 10x and the other angle measures 70 degrees.What is the value of x?

A) 10°
B) 11°
C) 20°
D) 21°

2. A right angle is shown divided in two parts. The measure of the angle of one part is 30 degrees and the measure of the other part is 5x plus 15 degrees. What is the value of x?

A) 3
B) 9
C) 12
D) 15

Answers

1.
supplementary add to 180
10x+70=180
minus 70 both sides
10x=110
divid both sides by 10
x=11 degrees
B

2.
right angle is 90 degrees
30+5x+15=90
5x+45=90
minus 45 both sides
5x=45
divide 5 both sides
x=9
B

1. B
2. B

1) 10x+70 = 180

10x = 180-70

10x = 110

x =11

2) 5x+15+30 =90

5x = 90-45

x = 45/5

x = 9

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