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padilas [110]
3 years ago
11

Evaluate the expression 5xy+ -2xy+y^2 when x=4 and y=-5

Mathematics
2 answers:
Mariulka [41]3 years ago
7 0

Answer:

-35

Step-by-step explanation:

5(4)(-5) + -2(4)(-5) + (-5)²

= -100 + 40 + 25

= -35

aniked [119]3 years ago
4 0

Answer: -35

Step-by-step explanation:

5(4)(-5)+(-2)(4)(-5)+(-5)^2

-100+40+25

-35

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Write two expressions where the solution is 28
kvv77 [185]
16 + 12

Another one would be...

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3 years ago
Using the results from a survey of 1050 elibible voters, an approximate 98% confidence interval estimate for the proportion of v
Soloha48 [4]

Answer: p= 0.644

Step-by-step explanation:

We know that, the confidence interval for population proportion is given by :-

sample proportion(p) ± Margin of error(E)

Given confidence interval :  (0.61,0.678)

i.e. p- E = 0.61   ... (i)

p+E = 0.678    ...(ii)

Adding (i) and (ii), we get

2p = 1.288

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From (ii),

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3 0
3 years ago
Can someone please help me with number 28 I’ll give brainliest
aleksklad [387]

Yo sup??

Just take a straightedge and carefully draw 3 parallel lines.

Now draw any arbitrary line that cuts all the 3 parallel lines and you will get your desired figure. (use straightedge for drawing this)

Name this transversal line as AB.

Refer this image line:

Source: Internet

Hope this helps.

4 0
3 years ago
Explanations not just answers: Sarah measures the angle of elevation to the top of a tree as 23.6 degrees from the point which i
Reika [66]
See the attached diagram.

In the right triangle, x is opposite the 23.6 degree angle, and the adjacent side is 250 m.  This suggests using the tangent ratio.

\frac{x}{250}=\tan 23.6 ^\circ \\ x=250 \cdot \tan 23.6^\circ \approx 109.2

Finally, to get the height of the tree, add Sarah's height, 1.5 m.

The tree is approximately 110.7m tall.

6 0
4 years ago
How do you solve #18?
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Pizzas are circles. Area of circles is (pi)r^2.

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5 0
3 years ago
Read 2 more answers
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