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tamaranim1 [39]
3 years ago
14

NEED HELP ASAPI need answers please ​

Mathematics
2 answers:
malfutka [58]3 years ago
8 0

Answer:

Step-by-step explanation:

10) Cos (x-y) = cos x cos y + sin x sin y

cos 4x cox 3x + sin 4x sin 3x = Cos (4x - 3x)

  = cos x

11) = 2*(1² + 2) + 2*(2² + 2²)

  = 2*3 + 2*(4+4)

= 6 + 2*8

= 6 + 16

= 22

12) (3) 4x² - 3x  - 8 = 0

Reason:  

Sum of roots = - Coefficient of x/coefficient of x² = -(-3)/4 = 3/4

Product of roots = constant / coefficient of x² = -8/4 = -2

Tanzania [10]3 years ago
4 0
Should’ve listened in class buddy
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3. For the function, :c(X)=x^2+4x-5 over x+5<br> (a) Identify the restricted domain value(s).
Mrrafil [7]
Domain is all the possible inputs of an equation. In this example, the only concern is the x + 5 because the denominator cannot equal 0 because we can't divided by 0. So we set x + 5 equal to zero and solve for x.

x + 5 = 0
x = -5
The restriction is that x cannot equal -5.
8 0
4 years ago
Denzel can mow 1/8 of his yard every 7 minutes. If he had 40 minutes to mow 3/4 of the yard, will he have enough time
ehidna [41]

Answer:

No.  He is short by 2 minutes

Step-by-step explanation:

Given that Denzel can mow 1/8 of his yard every 7 minutes.

Hence he can mow the full yard in 7(8) = 56 minutes.

Now he has to do 3/4 of his yard and time is 40 minutes

For 3/4 of yard time taken would be = 3/4 (56) = 42 minutes.

If he had 40 minutes to mow 3/4 of the yard, he will not  have enough time  since he is short of time by 2 minutes.


8 0
3 years ago
A square prism and a cylinder have the same height. The area of the cross-section of the square prism is 157 square units, and t
Angelina_Jolie [31]

Answer:

The volume of the sqaure prism is eqaul to the volume of the cylinder.

3 0
3 years ago
A Dalmatian weighs 72 pounds. A bullmastiff is 24 pounds heavier than the Dalmatian. A bulldog is 12 pounds lighter than the bul
mestny [16]

Answer:

7:6

Step-by-step explanation:

Dalmatian: 72

Bullmastiff: 72 + 24

= 96

Bulldog: 96 - 12

= 84

Bulldog : Dalmatian

84 : 72

^ Simplify

7 : 6

7 0
4 years ago
Jason earned a total of $15900 from two part-time jobs. If he earned 3700 more from one job than the other , how much did he ear
KiRa [710]
Let's call job one x.

Job two can be y.

Jason earned $3,700 more from job y than x. Therefore y = x + 3700

From the two jobs, Jason earned $15,900. This can be written as x + y = 15900.

Now substitute y for x + 3700:

x + x + 3700 = 15900

2x + 3700 = 15900

Subtract 3700 from both sides:

2x = 12200

Divide both sides by 2:

x = 6100

Take the original equation x + y = 15900 and substitute x with 6100:

6100 + y = 15900

y = 9800

Job one (x) paid Jason $6,100.

Job two (y) paid Jason $9,800.
6 0
3 years ago
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