All categories

3 years ago

What is the best estimate for the product of 289 and 7

Mathematics

1 answer:

Monica [59]3 years ago

6 0

If you round up it would be (300 x 10)= 2100

Between 1,400 and 2,100

You might be interested in

Solve for x 7x-0.15=2x+0.6 Explain

11111nata11111 [884]

If you subtract 2x from each side you get 5x-0.15=0.6 because the subtraction of 2x on the right of the equal sign cancels out. Then, if you add 0.15 to both sides you will get 5x=0.75. Finally, if you divide both sides by 5 you get x = 0.15.

8 0

3 years ago

Rewrite the equation y^2 – 4y – 2x – 4 = 0 in standard form.

patriot [66]

y² - 4y - 2x - 4 = 0

+2x +4 +2x + 4

y² - 4y = 2x + 4

+4 +4

(y - 2)² = 2x + 8

-8 -8

(y - 2)² - 8 = 2x

$\frac{(y - 2)^{2}}{2} - \frac{8}{2} = \frac{2x}{2}$

$\frac{1}{2}$ (y - 2)² - 4 = x

x = $\frac{1}{2}$ (y - 2)² - 4

Note: this is a parabola whose axis of symmetry is y = 2 and vertex is (-4, 2)

8 0

3 years ago

A) 15 - 4 X 6 + 30 - 5

saw5 [17]

Answer:

Step-by-step explanation:

15 – 24 +30 – 5

–9+25

= 16

5 0

2 years ago

Read 2 more answers

Express in terms of trig functions of single x : (sin2x+cos2x)^2

RSB [31]

$(\sin 2 x+\cos 2 x)^{2}=1+\sin 4 x$

Solution:

Given trigonometric function:

$(\sin 2 x+\cos 2 x)^{2}$

Using perfect square formula:

$(a+b)^{2}=a^{2}+2 a b+b^{2}$

$a=\sin 2 x, b=\cos 2 x$

$(\sin 2 x+\cos 2 x)^{2}=\sin ^{2}(2 x)+2 \sin 2 x \cos 2 x+\cos ^{2}(2 x)$

Arranging square terms together.

$=\sin ^{2}(2 x)+\cos ^{2}(2 x)+2 \sin 2 x \cos 2 x$

Using the trigonometric identity: $\sin ^{2}x+\cos ^{2}x=1$

$=1+2 \cos 2 x \sin 2 x$

Using the trigonometric identity: $2 \cos \sin x=\sin 2 x$

$=1+\sin (2 \cdot 2 x)$

$=1+\sin 4 x$

Hence $(\sin 2 x+\cos 2 x)^{2}=1+\sin 4 x$ .

6 0

3 years ago

Determin d/dx (x²+1) (7x-3) and d/dt(3t-2/5t+1)

MArishka [77]

Answer:

2x(7x-3) + (x²+1)(7)

Step-by-step explanation: use product rule

8 0

2 years ago