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fgiga [73]
3 years ago
12

Need ko po answer plssssss

Mathematics
1 answer:
evablogger [386]3 years ago
7 0
It’s really blurry, I can’t help :(
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Element X is a radioactive isotope such that every 90 years, its mass decreases by half. Given that the initial mass of a sample
steposvetlana [31]

Answer:

approximately 27 grams

Work Shown:

Half life formula

y = A*(0.5)^(x/H)

where,

A = starting amount = 30 grams

H = half life period = 90 years

x = number of years that pass by = 12

y = amount left over after x years

Let's plug the values for x, A and H into the formula to find y

y = A*(0.5)^(x/H)

y = 30*(0.5)^(12/90)

y = 27.3516746567466

y = 27 .... rounding to the nearest whole number

4 0
3 years ago
Find the measure of angle x in the figure below: A.) 35° B.) 48° C.) 69° D.) 78°
prisoha [69]

Answer:

x = 48

Step-by-step explanation:

First find y

52+y+59 = 180 since they from a straight line

y = 180-59-52

y = 69

Then we know the angles of a triangle add to 180

x+y+63 = 180

x+69+63 = 180

x = 180-69-63

x =48

3 0
3 years ago
Read 2 more answers
A 15% tax is to be applied to a $120 pair of shoes. Find the total price.
postnew [5]

Total cost of item = $138

Explanation:

The tax percentage = 15%

cost of item = $120

sales tax = cost of item × The tax percentage

sales tax = 120 × 15%

=120 × 0.15

sales tax = $18

Total cost of item = initial cost of item + sales tax

Total cost of item = 120 + 18

Total cost of item = $138

7 0
1 year ago
Estimate the total shaded area below, list all that are correct: A. 14/28 B. 2 1/10 C. 2 100/200 D. 5/2
Nonamiya [84]

Answer:

it is 2 1/10 i took the test from K12

Step-by-step explanation:

5 0
3 years ago
Can someone helpp???
neonofarm [45]
AD and FC are perpendicular so they make a 90 degree angles. Angle BDC is equal to angle FDE so its 25. then u take 90 and subtract 25 to find the anser your looking for... so its 65
6 0
3 years ago
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