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3 years ago

I need help with my assignment, does anyone know the answer to this?

Mathematics

2 answers:

vampirchik [111]3 years ago

4 0

Answer:

What times 7 divided by three gets you 52.5. That's what you need to ask yourself. The formula is B×H÷3.

Hope this helps

Step-by-step explanation:

Fittoniya [83]3 years ago

3 0

Answer:

The base length of the triangle is 15 units

Step-by-step explanation:

The area of a triangle is given by the formula; 1/2 *base* perpendicular height. In the presented scenario, we can determine the base by solving for base in the given equation; 1/2 *base*7 =52.5. Multiply both sides by 2 yields; base*7 =105. Dividing by 7 yields; base=15 units

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Studies have suggusted that twins, in their early years, tend to have lower IQs and pick up language more slowly than non-twins.

Anna007 [38]

Answer:

Confidence interval: (21.9, 32.9).

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 26 - 1 = 25

98% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 25 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.98}{2} = 0.99$ . So we have T = 2.485

The margin of error is:

$M = T\frac{s}{\sqrt{n}} = 2.485\frac{11.2}{\sqrt{26}} = 5.5$

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 27.4 - 5.5 = 21.9 hours

The upper end of the interval is the sample mean added to M. So it is 27.4 + 5.5 = 32.9 hours

Confidence interval: (21.9, 32.9).

5 0

2 years ago

Solve the inequality: 5x + 14 greater than or equal too 54

White raven [17]

Answer:

5*8+14=54

Step-by-step explanation:

5*x+14= 54

54-14= 40

40/5=8

so x=8

7 0

2 years ago

Identify the quotient in the form a + bi. HELP ASAP PLEASE!!

Step2247 [10]

Solving the expression $\frac{4-5i}{2+3i}$ we get $-\frac{7}{13}-\frac{22i}{13}$

So, Option A is correct.

Step-by-step explanation:

We need to solve the expression: $\frac{4-5i}{2+3i}$

Multiplying and dividing by 2-3i

$=\frac{4-5i}{2+3i}*\frac{2-3i}{2-3i}\\=\frac{4-5i*2-3i}{2+3i*2-3i}\\=\frac{4(2-3i)-5i(2-3i)}{(2)^2-(3i)^2}\\=\frac{8-12i-10i+15i^2)}{4-9i^2}\\We\,\,know\,\, i^2=-1\\=\frac{8-12i-10i+15(-1)}{4-9(-1)}\\=\frac{8-15-12i-10i}{4+9}\\=\frac{-7-22i}{13}\\=-\frac{7}{13}-\frac{22i}{13}$