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zaharov [31]
3 years ago
9

If y varies directly as x, and y is 400 when x is rand y is r when x is 4 what is the numeric constant of variation in this rela

tion?
Mathematics
1 answer:
s344n2d4d5 [400]3 years ago
3 0

Answer:

Step-by-step explanation:

y = kx

400 = kr . . . . . . (1)

also, r = 4k . . . .(2)

400 = k(4k) = 4k^2

k^2 = 400/4 = 100

k = sqrt(100) = 10

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nikitadnepr [17]

Answer:

$6,291.70

Step-by-step explanation:

You're given the equation and you're given an x-value; 75,834. Just plug it in to get m = 2500 + 0.05(75,834) = 2500 + 3791.70 = 6,291.70

3 0
3 years ago
mike observed that 75% of the students of a school liked skating. if 35 students of the school didn't like skating, the number o
bezimeni [28]
Cross multiply.

75 / x = 25 / 35
   25x = 35(75)
   25x = 2625
   /25     /25
       x = 105

Therefore 105 students liked skating.

Proof:

105 + 35 = 140.
140 * 0.75 = 105
140 * 0.25 = 35

140 (total) split into quarters.

35 + 35 + 35 + 35 = 140
35 + 35 + 35 = 105 (3 quarters liked)
35 = 35 (1 quarter disliked)
3 0
3 years ago
Please help me !!!!!!
irinina [24]

Answer:

Use a cauculator :D

4 0
3 years ago
Which expression has a value of 66? A. (16 ÷ 3.2) × 2 + 0.2 × (8 + 82) B. [(16 ÷ 3.2) × (2 + 0.2)] × 8 + 82 C. 16 ÷ [(3.2 × 2) +
Setler [38]

Answer: none

Step-by-step explanation:

(A)

(16÷32/10) ×2 + 0.2×(90)

Using bodmas principle ; solve bracket

(16×10/32)×2 + (2/10×90)

10+18 =28

(B)

{(16÷32/10) × (2+2/10)} ×90

Open brackets

{(16×10/32) × (22/10)} ×90

(5×11/5) ×90

11×90 = 990

(C)

16÷{(32/10×2) + (2/10×8)} +82

Open brackets, solve division first, dolled by addition

16÷(32/5 + 8/5) +82

16÷(40/5) +82

16÷8 +82

2+82= 84

(D)

[16÷(32/10 ×2) + 0.2× (90)]

16÷ (32/5) + 2/10 ×90

Solve division

16×5/32 + 18

5/2 + 18

L.c.m of denominator (2&1) =2

(5+36) / 2 = 41/2

=20.5

8 0
3 years ago
Mya is paid $960 a week to walk 20 dogs. If she is paid the same amount to walk each dog , what is the cost to walk one dog each
Sveta_85 [38]
We know that

<span>Mya is paid $960 a week to walk 20 dogs
then
</span>$960/20 dogs-----> $48 for one dog each week

the answer is
the cost to walk one dog each week is $48
7 0
3 years ago
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