MATHEMATICS HIGH SCHOOL

Simplify -78 ÷ (-9)(Write answer as a mixed number: whole and fraction remaining.)

Answers

Answer 1
Answer:

Answer:

8 2/3

Y-E-E-T

Step-by-step explanation:

-78 divded by (-9)

-78

-----

-9

there are negatives on both sides. I don't know how to explain that but you can change it to a PLUS.

78/9

divide 3 on both sides

78/3 =26

9/3=3

26/3 now.

so the mixed number would be 8 2/3
Answer 2
Answer: 8 and 2/3
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What value of r makes the equation true? r + (–0.16) = 0.37a. –0.53b. –0.21c. 0.21d. 0.53
Which of the following shows that polynomials are closed under subtraction when polynomial 5x − 6 is subtracted from 3x2 − 6x + 2?answers: 3x2 − 11x + 8 may or may not be a polynomial 3x2 − 11x + 8 will be a polynomial 3x2 − x + 4 may or may not be a polynomial 3x2 − x + 4 will be a polynomial

Biologists are treating a lake contaminated with bacteria. The level of contamination is changing at a rate of dN/dt=-1110/t² -230 bacteria percubic centimeter per day, where is the number of days since treatment began. Find a function N(t) to estimate the level of contamination if the
level after I day was 5380 bacteria per cubic centimeter.

Answers

Answer: the function N(t) to estimate the level of contamination in the lake is:

N(t) = -1110 ln(t) - 230t + 1110 ln(I) + 230I + 5380

Step-by-step explanation: ∫ dN/dt dt = ∫ (-1110/t² -230) dt

N(t) = -1110 ln(t) - 230t + C  

N(I) = -1110 ln(I) - 230I + C = 5380

C = 1110 ln(I) + 230I + 5380

Math Homework about Trigonometry - Sine Rule.On a map whose scale is 8 cm to 1 km, an estate is shown as a quadrilateral ABCD. The length of the diagonal AC is 7 cm, BÂC = 55°, BĈA = 77°, DÂC = 90° and DĈA = 40°. (DRAW THE FIGURE)
Calculate:
a) the length, in cm, of the side AB on the map;
b) the length, in km, which represented by AD;
c) the area, in km², which represented by ΔADC.

Answers

The length of the side AB in cm is 9.45.

The length of the side AD in km is 1.02.

The area of ΔADC is 3.56 km².

How to find exterior angle of a triangle ?

The exterior angle of a triangle is sum of two opposite interior angles.

a)

The length of the side AB in cm on the map

∠B A C = 55 deg , ∠B C A = 77 deg

∴ ∠C A B is

We know the sum of all the interior angles of a triangle is 180 deg

So, ∠B A C + ∠B C A + ∠CAB = 180 deg

                55° +77° + ∠CAB = 180 deg

                ∠C A B = 48°

∴ sin B= 7/AB

 sin 48 deg = 7/AB

     AB = 7/0.74

     AB = 9.45 cm.

b)

The length of AD in km is

Again from interior angle theorem ∠ADC is

= 60 deg

So,sin 60 deg = 7/AD

     0.86 = 7/AD

        AD = 8.14 cm

∴AD in km is 1.02 k m s.

c)

The area of Δ ADC is

= 1/2 × AC × AD

= 1/2 × 7 × 8.14

= 28.5 cm²

So, the area in km²is

= 3.56 km².

Learn more about triangles here :

brainly.com/question/16886469

#SPJ2
The answer on un attached file.

Meredith practices the piano for 3 hours each week. How many hours will she practice in 8 weeks?

Answers

The answer is 3 the number of hours in the week, multiplied by 8 the number of weeks she will practice, so the answer is 24.
If Meredith practices 3 hours a week, and the question is asking how many hours she will practice in 8 weeks, the answer is 24. It is 24 hours because 3×8=24 :)
Hope I helped!! Please mark as Brainliest. 

James, Priya, and Siobhan work in a grocery store. James makes $9.00 per hour. Priya makes 40% more than James, and Siobhan makes 15% less than Priya. How much does Siobhan make per hour?

Answers

Answer:

Siobhan makes $10.71

Step-by-step explanation:

9.00 + 40% = 12.60

Priya makes $12.60.

12.6 - 15% = 10.71

Siobhan makes $10.71

Brainliest Please!!

Equations with the variable on both sides . solve 2+ 6x = 1-x

Answers

so 2+6x=1-x
we can do anything as long as we do it to both sides
2+6x=1-x
try to get the unknown (x) on one side by itself
add x to both sides to get rid of the x on the right
2+x+6x=1+x-x
2+7x=1
subtract 2 from both sdies
7x=-1
divide by 7
x=-1/7
2 + 6x = 1 - x
+ 6x + x = 1 - 2
7x = - 1
x = - 1
        7

Solution: -1/7 

Five eighths added to Q number is 4. Determine the number.

Answers

Yes five eights added to Q is 4!
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