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3 years ago

7 is 40% of what number

Mathematics

1 answer:

dedylja [7]3 years ago

3 0

40% means 0.4 .

So . . . . . 7 = 0.4 N .

Divide each side by 0.4 . . . N = 7/0.4 = 17.5

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Find x and y intercepts y=(2x+10)(x-2)

slega [8]

Step-by-step explanation:

$y = (2x + 10)(x - 2)$

$y = 2x(x - 2) + 10(x - 2)$

$y = 2x ^{2} - 4x + 10x - 20$

$y = 2x ^{2} + 6x - 20$

$to \: find \: x \: intercept \: y = 0$

$0 = 2x ^{2} + 6x - 20$

$x = 2 \: or \: - 5$

$to \: find \: y \: intercept \: x = 0$

$y = 2(0)^{2} + 6(0) - 20$

$y = - 20$

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3 years ago

Solve for x X/6 = 10 A) X = 4 B) X = 10 C) X = 16 D) X = 60

Lina20 [59]

x/6 = 10

In a equation , you can use every math operation you know as long as you do the same thing on both sides.

Here we have x/6 = 10

But what I want is x .

Here X is split in 6. So I 'm going to multiplicate all by 6 to find the original amount of X

In bold operation that are often not written but that you must understand to do that kind of exercices.

So : x/6 = 10

(x/6) *6 = 10 *6

6x/6 = 60

x = 60

4 0

3 years ago

Solve the inequality 4(c-3)>10

KiRa [710]

C>6 should be the answer

4 0

3 years ago

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Consider function f and g f(x)=x^2+7x g(x)=3x-1 what is the value of (f•g)(x)

Nadya [2.5K]

9514 1404 393

Answer:

B. 9x² +15x -6

Step-by-step explanation:

The composition operator means that function f is applied to function g:

$(f\circ g)(x)=f(g(x))=f(3x-1)\\\\=(3x-1)^2+7(3x-1)\\\\=9x^2-6x+1+21x-7\\\\\boxed{(f\circ g)(x)=9x^2+15x-6}\qquad\textbf{matches B}$

6 0

3 years ago

The age of Tony and Vihaan are in the ratio of 8:7. Six years later, their ages will be in the ratio 10:9. Find their ages.

Alex_Xolod [135]

Answer:

24 and 21

Step-by-step explanation:

the ratio of their ages is 8 : 7 = 8x : 7x ( x is a multiplier )

In 6 years

8x + 6 : 7x + 6 = 10 : 9

Express the ratio in fractional form

$\frac{8x+6}{7x+6}$ = $\frac{10}{9}$ ( cross- multiply )

9(8x + 6) = 10(7x + 6) ← distribute parenthesis on both sides

72x + 54 = 70x + 60 ( subtract 70x from both sides )

2x + 54 = 60 ( subtract 54 from both sides )

2x = 6 ( divide both sides by 2 )

x = 3

Thus

Tony = 8x = 8 × 3 = 24

Vihaan = 7x = 7 × 3 = 21

4 0

3 years ago

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