Answer:
the top one is $12.
Step-by-step explanation:
simple: 48÷4=12 because 4×10=40.
4×2=8. 40+8=48 which is the amount of money it costs, so add the 2 factors that aren't 4 to get your answer. (division is similar to reverse multiplication)
Answer:
Step-by-step explanation:
Triangles CEF and CAD are similar right triangles (they have the common angle, so by AA postulate they are similar). Similar triangles have proportional corresponding sides, so
Triangles DEF and DBC are similar right triangles (they have the common angle, so by AA postulate they are similar). Similar triangles have proportional corresponding sides, so
Substitute the fraction 
from the first equality into the second equality:
![\dfrac{EF}{30}=1-\dfrac{EF}{40}\ [\text{Muliply by 120}]\\ \\4EF=120-3EF\\ \\4EF+3EF=120\\ \\7EF=120\\ \\EF=\dfrac{120}{7}=17\dfrac{1}{7}\ ft](https://tex.z-dn.net/?f=%5Cdfrac%7BEF%7D%7B30%7D%3D1-%5Cdfrac%7BEF%7D%7B40%7D%5C%20%5B%5Ctext%7BMuliply%20by%20120%7D%5D%5C%5C%20%5C%5C4EF%3D120-3EF%5C%5C%20%5C%5C4EF%2B3EF%3D120%5C%5C%20%5C%5C7EF%3D120%5C%5C%20%5C%5CEF%3D%5Cdfrac%7B120%7D%7B7%7D%3D17%5Cdfrac%7B1%7D%7B7%7D%5C%20ft)
Can't read the top questions mate !
No, his bpm is too high, the average heart will go about 217-227.5 in a span of 3 1/2 min, and his is about 15.75 to high, (his bpm is 68 while it should be 62-65)
To answer this question, you need to know that a scale factor is the relationship between one dimension of the shape.
Because the information given to us is a two-dimensional measurement, you will need to consider that when getting the answer.
The ratios of the areas of the triangles is 3/5 x 3/5 or 9/25.
To determine the area of the larger triangle, you will solve the following equation using the information you know. x is the area of the larger triangle.
9/25x = 576; solve for x by dividing both sides by 9/25
x = 1600 square inches
The area of the larger triangle is 1600 square inches.
