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Semmy [17]
3 years ago
10

Level B

Mathematics
1 answer:
Darya [45]3 years ago
5 0
The number has 2 digits - let's call them x and y. The positive difference between the two combinations (lowest-highest and highest-lowest) is always equal to the positive difference of x and y, multiplied by 9.

For example:

76 and 67: 76 - 67 = 9 and ((7-6)*9) = 1*9 = 9
73 and 37: 73 - 37 = 36 and ((7-3)*9) = 4*9 = 36
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*in the image above x=23 cm. find the surface area of the figure <br> (help pls)
svlad2 [7]

Answer:

3174cm^{2}

Step-by-step explanation:

Each square has an area of 529cm^{2}

So we multiply that by the number of squares which is 6.

8 0
2 years ago
G in how many ways can first, second, and third prizes be awarded in a contest with 335 contestants?
vladimir1956 [14]
Let the number of contestants is n and the prizes is r
the number of ways is npr = 335p3 = 37259370 ways

8 0
3 years ago
Simplify the radical expression √(5) + 6√(5)
Evgesh-ka [11]
Answer is  <span>C) 7√(5)
cause

</span><span>√(5) + 6√(5)
</span>=<span>√5 (1+6)
</span>= 7<span>√5</span>
8 0
3 years ago
Require help with this question
user100 [1]
A) There are a number of ways to compute the determinant of a 3x3 matrix. Since k is on the bottom row, it is convenient to compute the cofactors of the numbers on the bottom row. Then the determinant is ...
  1×(2×-1 -3×1) -k×(3×-1 -2×1) +2×(3×3 -2×2) = 5 -5k

bi) Π₁ can be written using r = (x, y, z).
  Π₁ ⇒ 3x +2y +z = 4

bii) The cross product of the coefficients of λ and μ will give the normal to the plane. The dot-product of that with the constant vector will give the desired constant.
  Π₂ ⇒ ((1, 0, 2)×(1, -1, -1))•(x, y, z) = ((1, 0, 2)×(1, -1, -1))•(1, 2, 3)
  Π₂ ⇒ 2x +3y -z = 5

c) If the three planes form a sheath, the ranks of their coefficient matrix and that of the augmented matrix must be 2. That is, the determinant must be zero. The value of k that makes the determinant zero is found in part (a) to be -1.

A common approach to determining the rank of a matrix is to reduce it to row echelon form. Then the number of independent rows becomes obvious. (It is the number of non-zero rows.) This form for k=-1 is shown in the picture.

5 0
3 years ago
Write -1/19, 7/4, -4/7 from least to greatest
zysi [14]

Answer:

-4/7, -1/19, 7/4

Step-by-step explanation:

The fractions converted into decimals would be -0.05, 1.75, -0.57

4 0
3 years ago
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