MATHEMATICS MIDDLE SCHOOL

1. if (x) =-3x+8, find f(5).​

Answers

Answer 1
Answer:

Answer:

-7

Step-by-step explanation:

f (5) means to substitute 5 wherever there is an x.

So f (5) = -3 (5)+8

=-15 +8

= -7
Answer 2
Answer: the answer would be -7 becuase you would plug in 5 for the x. which would make the equation -3(5)+8.

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Please help!!!Given the length of three sides of a triangle, which is a right triangle?
(1) 10,26,24
(2) 20,12,18
(3) 30,15,26
(4) 40,50,80

And also explain why it is the answer.

Answers

Pythagorean Theorem: a^2 + b^2 = c^2
c represents the longest side of the triangle
If the triangle is a right triangle, the Pythagorean theorem will be true.

(1) 10,24,26
10^2 + 24^2 = 676
26^2 = 676
10^2 + 24^2 = 26^2
Right Triangle

(2) 12,18,20
12^2 + 18^2 = 468
20^2 = 400
12^2 + 18^2 \neq 20^2
Not a right triangle

(3) 15,26,30
15^2 + 26^2 = 901
30^2 = 900
15^2 + 26^2 \neq 30^2
Not a right triangle

(4) 40,50,80
40^2 + 50^2 = 4100
80^2 = 6400
40^2+50^2 \neq 80^2
Not a right triangle

#1 is a right triangle

Jacob is making a stew. The stew calls for 3/8 cup of rice. If he triples the recipe, how much rice will he need?

Answers

Multiply by 3 so 3/8×3/1=9/8 / 1 1/8 cup of rice

40 is 50% of what number?

Answers

Steps:
1. Do a proportion
40/x equals 50/100
2. 40 times 100 equals 4,000
3. Do 4,000 divided by 50 equals 80
4. Your answer is 80

42 divided by 6 in repeated subtraction

Answers

42 - 6 = 36 - 136 - 6 = 30 - 230 - 6 = 24 - 324 - 6 = 18 - 418 - 6 = 12 - 512 - 6 = 6 - 66 - 6 = 0 - 742/6 = 7
42-6=36
36-6=30
30-6=24
24-6=18
18-6=12
12-6=6
6-6=0

Find the value of the missing trigonometric ratio of each triangle? help me HURRY!!! ​

Answers

Answer:

The value of cosA = (√3)/2 and tanA = 1/√3 or (√3)/3.

Step-by-step explanation:

Firstly,youhavetofindthevalueofadjacentusingPythogoras'Theorem,a²=b²+c²:

Let a = 2, b = 1

2² = 1² + c²

c² = 2² - 1²

= 4 - 1

= 3

c = √3

NowwehavefoundtheadjacentsowecanfindcosAandtanAusingTrigonometricfunction,cosθ=adj./hypo.andtanθ=oppo./adj.:

adj. = √3

oppo. = 1

hypo. 2

cosA = (√3)/2

tanA = 1/√3 OR (√3)/3

Need help with this question.

Answers

13.55 / 5 = 2.71. 2.71 x 8 = 21.68
the answer is c.) $21.68
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