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3 years ago

2x4-4=? Helpppppppp pis

Mathematics

2 answers:

DerKrebs [107]3 years ago

6 0

Answer:

Step-by-step explanation:

using pemdas, do 2 times 4 first which ends up as 8, and then subtract 4 from it leaving you w the answer 4

diamong [38]3 years ago

3 0

Answer: 2

Step-by-step explanation:

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Write an expression for the number of butterflies after 4 minutes .use the power of 2 in your awnser

topjm [15]

There are 2² butterflies.
Or simply 2²

8 0

3 years ago

Answer 15 points ( don’t answer if you don’t the answer )

BabaBlast [244]

Answer:

V=1/3hπr². Basically, 1/3 x height x 3.14 (pi) x radius squared.

Step-by-step explanation:

The formula of figure 2 would be 1/3 x 15 x 3.14 x 8 squared. The volume of figure 2 would be 1005.30965

the formula for figure 3 would be 1/3 x 15 x 3.14 x 4 squared. The volume of it would be 251.32741

hope this helps! (Also please make me brainliest if this helps u :) )

8 0

3 years ago

Kent constructs 1 1/4 building models in 1/5 of an hour. How many models can he construct in one hour?

marissa [1.9K]

Answer:

2/4

Step-by-step explanation:

7 0

3 years ago

A sample of a radioactive substance decayed to 97% of its original amount after a year. (Round your answers to two decimal place

Andrej [43]

Answer:

a) The half life of the substance is 22.76 years.

b) 5.34 years for the sample to decay to 85% of its original amount

Step-by-step explanation:

The amount of the radioactive substance after t years is modeled by the following equation:

$P(t) = P(0)(1-r)^{t}$

In which P(0) is the initial amount and r is the decay rate.

A sample of a radioactive substance decayed to 97% of its original amount after a year.

This means that:

$P(1) = 0.97P(0)$

Then

$P(t) = P(0)(1-r)^{t}$

$0.97P(0) = P(0)(1-r)^{0}$

$1 - r = 0.97$

$P(t) = P(0)(0.97t)^{t}$

(a) What is the half-life of the substance?

This is t for which P(t) = 0.5P(0). So

$P(t) = P(0)(0.97t)^{t}$

$0.5P(0) = P(0)(0.97t)^{t}$

$(0.97)^{t} = 0.5$

$\log{(0.97)^{t}} = \log{0.5}$

$t\log{0.97} = \log{0.5}$

$t = \frac{\log{0.5}}{\log{0.97}}$

$t = 22.76$

The half life of the substance is 22.76 years.

(b) How long would it take the sample to decay to 85% of its original amount?

This is t for which P(t) = 0.85P(0). So

$P(t) = P(0)(0.97t)^{t}$

$0.85P(0) = P(0)(0.97t)^{t}$

$(0.97)^{t} = 0.85$

$\log{(0.97)^{t}} = \log{0.85}$

$t\log{0.97} = \log{0.85}$

$t = \frac{\log{0.85}}{\log{0.97}}$

$t = 5.34$

5.34 years for the sample to decay to 85% of its original amount

8 0

4 years ago

Find x (2x + 50) (3x - 10°) final answer needs to equal 90°!!!! Please help ??

bonufazy [111]

Answer: x = 10°
(2x + 50) = 70°
(3x - 10) = 20°

Steps:
(2x + 50)° + (3x -10)° = 90°
2x + 50 + 3x - 10 = 90°
5x + 40 = 90°
5x = 50°
x = 10°

(2x + 50)
2(10) + 50
20 + 50
70

(3x - 10)
3(10) - 10
30 - 10
20

Check:
70 + 20 = 90
90 = 90 ✅

6 0

3 years ago