How to solve the equation (30% x 150) / x = 3 / 8

How to solve the equation (30% x 150) / x = 3 / 8

0.3*150=3x/8
45=3x/8

The equation of line passing through point P (1,2) and perpendicular to line 2x + Y-10 = 0 is

The slope of the line perpendicular to the line 2x + Y-10 = 0 is 1 / 2
y=1/2x+k
Bring in P (1,2)
k=3/2
Then y = 1 / 2x + 3 / 2

87 is 63 more than 2 / 3 of a number, which is calculated by? Formula

This number = (87-63) / (2 / 3) = 24 / (2 / 3) = 36;

For rational numbers x and y, a new operation is defined: X * y = ax + by, where a and B are constants. On the right side of the equation are the usual addition and multiplication operations. Given that 1 * 2 = 9, (- 3) * 3 = 6, find the value of 2 * (- 7)

According to the meaning of the problem, we can get the solution of the equation system a + 2B = 9 − 3A + 3B = 6, and get a = 53B = 113. Then the new operation xy = ax + by can be replaced by xy = 53x + 113y, so 2 × (- 7) = 2 × 53 + (- 7) × 113 = - 673

How much is 4 meters 25 cm + 30 decimeters
3Q!
Help me figure it out

4m25cm+30dm=7.25m=72.5dm=725cm

In △ ABC, if ⊥ A: ⊥ B: ⊥ C = 1:2:3, CD ⊥ AB is D, ab = a, then DB = ()
A. a4B. a3C. a2D. 3a4

As shown in the figure, in △ ABC, ∠ A: ∠ B: ∠ C = 1:2:3, ≠ a = 30 °, B = 60 °, C = 90 °, BC = 12ab, and ∵ CD ⊥ AB in D, ab = a, ∵ BCD = 30 ° and ∵ DB = 12bc = 14ab = A4

A shampoo shop, for promotional activities, 16 yuan per bottle. A way to buy three bottles to get a free bottle, B way cheaper 2 yuan. Ask which way the unit price is cheaper

Of course, it's mode A. 4 bottles for 48 yuan. 4 bottles for 56 yuan for mode B

Given x > 0, Y > 0, x + y + xy = 8, then the minimum value of X + y is______ ．

∵ x > 0, Y > 0, and X + y + xy = 8, ∵ x + y = 8-xy ≥ 8 - (x + Y2) 2, that is, (x + y) 2 + 4 (x + y) - 32 ≥ 0, ∵ x + y ≤ - 8 or X + y ≥ 4, ∵ x > 0, Y > 0,