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3 years ago

2+2? cuanto es? ayudaaaaa

Mathematics

2 answers:

BartSMP [9]3 years ago

8 0

The answer is 4. I just added.

Vesna [10]3 years ago

6 0

You're answer will be 4 think of it as apples if you have 2 apples and a friend gives you 2 apples then you will have 4 apples all together

You might be interested in

An angle measures 72° less than the measure of its complementary angle. What is the measure of each angle?

Ronch [10]

Answer:

81 and 9

Step-by-step explanation:

Okay, so if 2 angles are complementary, it means that when they are added together, they equal 90 degrees. So using this, we can make an equation. Let's call one angle x and the other that is 72 less than angle x can be described as x - 72. Now let's make that into an equation.

90 = x + x -72

So in order to solve this, we need to get x by itself. So we need to add 72 on both sides, and the equation should now look like this:

162 = x + x

Now we have to add the x's together.

162 = 2x

Now in order to isolate x, you divide by 2 on both sides.

X = 81

So we now know the larger angle is 81, and the smaller angle which is 72 less, would be 9.

3 0

3 years ago

(3x2 + 10x + 3) by (x + 3)

Nata [24]

Explanation: 3 x 2 + 10 x + 3 We can Split the Middle Term of this expression to factorise it. In this technique, if we have to factorise an expression like a x 2 + b x + c , we need to think of 2 numbers such that: N 1 ⋅ N 2 = a ⋅ c = 3 ⋅ 3 = 9 and, N 1 + N 2 = b = 10 After trying out a few numbers we get: N 1 = 9 and N 2 = 1 9 ⋅ 1 = 9 , and 9 + ( 1 ) = 10 3 x 2 + 10 x + 3 = 3 x 2 + 9 x + 1 x + 3 = 3 x ( x + 3 ) + 1 ( x + 3 ) ( 3 x + 1 ) ( x + 3 ) is the factorised form for the expression.

c
, we need to think of 2 numbers such that:
N
1
⋅
N
2
=
a
⋅
c
=
3
⋅
3
=
9

and,
N
1
+
N
2
=
b
=
10
After trying out a few numbers we get:
N
1
=
9
and
N
2
=
1

9
⋅
1
=
9
, and
9
+
(
1
)
=
10
3
x
2
+
10
x
+
3
=
3
x
2
+
9
x
+
1
x
+
3

=
3
x
(
x
+
3
)
+
1
(
x
+
3
)
(
3
x
+
1
)
(
x
+
3
)
is the factorised form for the expression.

6 0

3 years ago

Factor 7y^2-21y^3 completely

maksim [4K]

Well you can take out a 7 and y^2 since both have it.
-3y should be your answer because you got rid of 7y^2 and then you have to divide -21/7 to get -3. Also if you take y^2 from y^3 you are left with just a "y".

8 0

3 years ago

A jacket is on sale for 40% off .The sale price is $90.00.What is the original amount of the jacket

34kurt

Set up a proportion
90/x = 60/100
60x = 9000
x = 150

if you're wondering why I used 60 instead of 40 in the proportion it is because $90 is 60% of the original price, not 40%

hope this helps!

6 0

3 years ago

Insurance companies are interested in knowing the population percent of drivers who always buckle up before riding in a car. Whe

kherson [118]

Answer:

$n=\frac{\hat p (1-\hat p)}{(\frac{ME}{z})^2}$

$n=\frac{0.5(1-0.5)}{(\frac{0.03}{1.96})^2}=1067.11$

And rounded up we have that n=1068

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The population proportion have the following distribution

$p \sim N(p,\sqrt{\frac{p(1-p)}{n}})$

Solution to the problem

In order to find the critical value we need to take in count that we are finding the interval for a proportion, so on this case we need to use the z distribution. Since our interval is at 95% of confidence, our significance level would be given by $\alpha=1-0.95=0.05$ and $\alpha/2 =0.025$ . And the critical value would be given by: