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Elena-2011 [213]
3 years ago
8

Solve -4a² - 1/5b + 1/7cif a = 3, b = -5, c = -21​

Mathematics
1 answer:
frutty [35]3 years ago
8 0

Answer:

Step-by-step explanation:

-4(3)² - 1/5(-5) + 1/7(-21)

-4(9) + 1 - 3

-36 + 1 - 3

-35 - 3 = -38

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A red light blinks every 12 seconds and a blue light blinks every 9 seconds. When will both lights blink at the same time?
mote1985 [20]

Answer:

36

Step-by-step explanation:

We need to find the LCM of the two numbers because we need to know the lowest number that 12 and 9 are both in.

12 × 1 = 12

12 × 2 = 24

12 × 3 = 36

12 × 4 = 48

9 × 1 = 9

9 × 2 = 18

9 × 3 = 27

9 × 4 = 36

We can see that 36 is the lowest number that occurs both in 12 and 9 so the blue and red light will both link at 36 seconds

3 0
3 years ago
The work of a student to solve a set of equations is shown:
Ivahew [28]
Step 1. Equation B could not have simplified out to 3y= 3 - 4z because Equation A's original equation was y= 15 - 2z. That means after the multiplication by -3, -3(y)= -3(15 - 2z) it would equal -3y= -45 + 6z.
3 0
4 years ago
WILL GIVE BRAINLIEST *NO LINKS*
77julia77 [94]

Answer:

2 out of 5

Step-by-step explanation:

I believe that 96/240 needs to be simplified until it cant anymore, an that is the probability because they both fit three, I will divide by three.

96/3=32

240/3= 80

<u>32/80</u>

  2

16/40 then because they both fit four, Ill do four.

4/10then 2 again

2/5 so, it is 2 out of five

please correct me if I am wrong, I was never good at probabilities, but I am better now.

6 0
3 years ago
Brainiest!!!!!!! please help
kvv77 [185]

The answer to this question is B, No solution

6 0
3 years ago
What is the length of the unknown leg in the right triangle?
DIA [1.3K]

Answer:

<h2>8</h2>

Step-by-step explanation:

A right angled triangle is made of three sides with the longest side being the hypotenuse. According to pythagoras theorem;

hyp^{2} = adj^{2}+opp^{2}

Given hypotenuse = \sqrt{87} and another side = \sqrt{23}, the third side can be gotten according to the formula above. On substituting;

(\sqrt{87} )^{2} = (\sqrt{23} )^{2} + x ^{2} \\x^{2} = (\sqrt{87} )^{2} - (\sqrt{23} )^{2}\\x^{2} = 87-23\\x^{2} = 64\\x =\sqrt{64}\\ x = 8

The length of the unknown leg in the right triangle is 8

7 0
3 years ago
Read 2 more answers
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